STORAGE CONFIGURATION BEST PRACTICES FOR SAP HANA TDI ON DELL EMC UNITY STORAGE SYSTEMS

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1 STORAGE CONFIGURATION BEST PRACTICES FOR SAP HANA TDI ON DELL EMC UNITY STORAGE SYSTEMS August 2017 ABSTRACT This solution guide describes storage best practices for SAP HANA in Tailored Data Center (TDI) deployments on Dell EMC Unity-certified enterprise storage family systems. The solution enables customers to use Dell EMC Unity for SAP HANA TDI deployments in a fully supported environment with their existing data center infrastructures, providing multiple benefits. H This document is not intended for audiences in China, Hong Kong, Taiwan, and Macao. SOLUTION GUIDE

2 Copyright The information in this publication is provided as is. Dell Inc. makes no representations or warranties of any kind with respect to the information in this publication, and specifically disclaims implied warranties of merchantability or fitness for a particular purpose. Use, copying, and distribution of any software described in this publication requires an applicable software license. Copyright 2017 Dell Inc. or its subsidiaries. All Rights Reserved. Dell, EMC, and other trademarks are trademarks of Dell Inc. or its subsidiaries. Intel, the Intel logo, the Intel Inside logo, and Xeon are trademarks of Intel Corporation in the U.S. and/or other countries. Other trademarks may be the property of their respective owners. Published in the USA 08/17. Solution Guide, H Dell EMC believes the information in this document is accurate as of its publication date. The information is subject to change without notice. 2 Storage Configuration Best Practices for SAP HANA TDI on Dell EMC Unity Storage Systems

3 Contents Contents Executive summary... 4 Introduction... 6 Technology overview and considerations... 7 Storage design recommendations for Dell EMC Unity arrays for SAP HANA Configuring Unity storage for HANA using Dell EMC Unisphere for Unity Accessing Unity storage from the SAP HANA nodes Conclusion References Storage Configuration Best Practices for SAP HANA TDI on Dell EMC Unity Storage Systems 3

4 Executive summary Executive summary Business case SAP HANA is an in-memory platform that can be deployed locally (on-premises) or in the cloud. It is a revolutionary platform that is ideally suited for performing realtime analytics and developing and deploying realtime applications. At the core of this realtime data platform is the SAP HANA database. As Figure 1 shows, SAP HANA can be deployed on-premises in two different models: Appliance model Tailored Datacenter Integration (TDI) model Figure 1. SAP HANA appliance model versus the TDI model (picture SAP SE) SAP HANA combines SAP software components that are optimized on proven hardware provided by SAP hardware partners. An SAP HANA appliance includes integrated storage, compute, and network components by default. The entire appliance is certified by SAP, built by one of the SAP HANA hardware partners, and shipped to customers with all software components preinstalled, including the operating systems and the SAP HANA software. The TDI approach provides more flexibility than the appliance deployment model; the SAP HANA servers must still meet the SAP HANA requirements and be HANA-certified by SAP, but the network and storage components can be shared across multiple applications. Customers can use their existing enterprise storage arrays and integrate SAP HANA seamlessly into existing data center operations, such as disaster recovery (DR), data protection, monitoring, and management, to reduce the time-to-value, risk, and costs of an overall SAP HANA adoption. Solution overview Dell EMC Unity x50f and x00(f) all-flash and hybrid arrays meet all performance and functional requirements for SAP HANA and are certified by SAP. This certification enables customers to use Dell EMC Unity for SAP HANA TDI deployments in a fully supported environment using their existing data center infrastructures. Using the SAP HANA hardware configuration check tool (hwcct), Dell EMC performed extensive testing on the Unity storage family systems in accordance with the SAP HANA- HWC-ES-1.1 certification scenario. Based on the test results, this solution guide describes 4 Storage Configuration Best Practices for SAP HANA TDI on Dell EMC Unity Storage Systems

5 Executive summary storage configuration recommendations for the Unity all-flash and hybrid arrays that meet SAP performance requirements (specifically, the SAP HANA TDI key performance indicators for data throughput and latency) and ensure the highest availability for database persistence on disk. Note: SAP recommends that TDI customers run the hwcct tool in their environment to ensure that their specific SAP HANA TDI implementation meets the SAP performance criteria. This solution guide describes SAP HANA TDI deployments in physical environments. If you plan to use SAP HANA in VMware virtualized environments on vsphere, see the VMware Virtualized SAP HANA with EMC Storage Solution Guide. Key benefits We value your feedback Customers using SAP HANA TDI on Unity arrays can: Integrate SAP HANA into an existing data center Use Unity shared enterprise storage to rely on already available, multisite concepts to benefit from established automation and operations processes Transition easily from an appliance-based model to the Unity-based TDI architecture, while relying on Dell EMC services to minimize risk Use their existing operational processes, skills, and tools and avoid the significant risks and costs associated with operational change Use performance and scale benefits of Unity to obtain realtime insights across the business Expect significant benefits using flash drives for the SAP HANA persistence by reducing SAP HANA startup, host auto-failover, and backup times Dell EMC and the authors of this document welcome your feedback on the solution and the solution documentation. Contact with your comments. Authors: Donagh Keeshan, Fergal Murphy, Jarvis Zhu, Pete Shi, Aighne Kearney Storage Configuration Best Practices for SAP HANA TDI on Dell EMC Unity Storage Systems 5

6 Introduction Introduction Document purpose Before the SAP HANA TDI deployment model was available, customers who used the appliance model experienced the following limitations: Limited choice of servers, networks, and storage Little knowledge and control of the critical components in the SAP HANA appliance Inability to use existing data center infrastructure and operational procedures, resulting in higher infrastructure startup costs Fixed sizes for SAP HANA server and storage capacities, leading to higher costs from lack of capacity and inability to respond rapidly to unexpected growth demands This guide describes a solution that uses SAP HANA in a TDI deployment scenario on Dell EMC Unity enterprise storage systems. This solution reduces hardware and operational costs, lowers risks, and increases server and network vendor flexibility. The guide provides configuration recommendations that are based on SAP requirements for high availability and on the performance tests and results that are required to meet the SAP key performance indicators (KPIs) for SAP HANA TDI. Scope Audience This document provides the following information: Best practices and tips for deploying the SAP HANA database on Dell EMC Unity all-flash and hybrid storage systems Descriptions of the configuration requirements and storage design recommendations for Unity with SAP HANA Steps for configuring Unity storage for SAP HANA using Dell EMC Unisphere TM for Unity Detailed instructions for accessing Unity storage from the SAP HANA nodes This guide is intended for system integrators, systems or storage administrators, customers, partners, and members of Dell EMC professional services who must configure a Unity all-flash or hybrid storage array to use in a TDI environment for SAP HANA. 6 Storage Configuration Best Practices for SAP HANA TDI on Dell EMC Unity Storage Systems

7 Technology overview and considerations Technology overview and considerations Dell EMC Unity system overview Dell EMC Unity provides customers with affordable all-flash performance solutions or cost-effective hybrid solutions by using a midrange system that is optimized for simplicity across the storage lifecyclethat is, simple to acquire, deploy, manage, and service. The Unity storage system is ideally suited for midsized deployments, Remote Office/Branch Office (ROBO) locations, and cost-sensitive, mixed-workload environments. Unity storage is designed for all-flash arrays and is available for converged deployment, as a hybrid system, and as a software-defined virtual edition. Figure 2 shows the Unity product family. Figure 2. Dell EMC Unity product family The Unity platform is offered in two different series of models, the x00(f) and the x50f. The x00(f) series includes the Unity 300 model and scales up to the Unity 600 model. Customers can order and configure Unity as either an all-flash or a hybrid system. The Unity all-flash models (300F to 600F) and hybrid models (300 to 600) are identical in form factor and connectivity, but scale correspondingly in processing and memory capabilities. The Unity All Flash series now includes four new models that are optimized for all-flash performance: the x50f models, starting with the 350F and scaling to the 650F. All new models feature additional processor cores and more system memory. The system limits change depending on the Unity model. For more information, see the Unity Technical Documentation data and specification sheets. Unity uses the latest technology in multicore processors, providing greater performance capabilities. Dell EMC recommends maximizing the use of flash drives in all Unity systems to optimize their performance potential. Note: Unity hybrid configurations support a maximum of 50 percent total flash capacity. If you require more than 50 percent flash capacity, consider a Unity all-flash configuration. Table 1 provides a detailed comparison of the Unity x00(f) models. Table 1. Unity x00(f) models compared Model Unity 300 Unity 400 Unity 500 Unity 600 Processor Intel E Intel E Intel E Intel E Memory 6c/1.6Ghz 24 GB / SP 8c/2.4GHz 48 GB / SP 10c/2.6GHz 64 GB / SP 12c/2.5Ghz 128 GB / SP Storage Configuration Best Practices for SAP HANA TDI on Dell EMC Unity Storage Systems 7

8 Technology overview and considerations Model Unity 300 Unity 400 Unity 500 Unity 600 Max Drives Max Capacity (Raw) 1.5 PB 2.5 PB 3.5 PB 5.0 PB Table 2 provides a detailed comparison of the Unity x50f models Table 2. Unity x50f models compared Model Unity 350F Unity 450F Unity 550F Unity 650F Processor 2*6-core, 1.7GHz 2*10-core, 2.2GHz 2*14-core, 2.0Hz 2*14-core, Memory 48 GB / SP 8c/2.4GHz 64 GB / SP 10c/2.6GHz 128GB / SP 2.4GHz 256 GB / SP Max Drives Max Capacity (Raw) 2.4 PB 4.0 PB 8.0 PB 16.0 PB Storage provisioning As a fully unified storage array, Unity offers both block and file provisioning in the same enclosure. Disks are provisioned into storage pools that can host both block and file data. Connectivity is offered for both block and file protocols. Block connectivityuse iscsi or Fibre Channel to access LUNs, consistency groups, VMware datastores, and VMware virtual volumes. File connectivitynetwork-attached storage (NAS) servers can host file systems that are accessed using server message block (SMB) shares or network file system (NFS) shares. NAS servers can also host VMware NFS datastores. Traditional storage pools All storage resources are provisioned from storage pools. A storage pool is a collection of physical disks that are arranged into an aggregate group, with some form of RAID applied to the disks to provide redundancy. Traditional storage pools apply RAID protection to discrete groups of drives within the storage pool. On a hybrid system, storage pools can consist of disks of varying types. These disks are sorted into one of three tiers: extreme performance (flash), performance (SAS), and capacity (NL-SAS). For hybrid systems with a fully automated storage tiering for virtual pools (FAST TM VP) license, you can configure a storage pool to contain multiple tiers of disks. This is known as a heterogeneous storage pool. When combined with FAST VP, heterogeneous storage pools can provide efficient balancing of data between tiers without requiring user intervention. Storage pools can also contain a single tier of disks; this is known as a homogeneous storage pool. Figure 3 shows the different storage pool configurations. 8 Storage Configuration Best Practices for SAP HANA TDI on Dell EMC Unity Storage Systems

9 Technology overview and considerations Figure 3. Storage pool configurations Each tier in a storage pool can have a different RAID configuration set. Another consideration for storage pools is the hot spare policy. The Unity system reserves one spare drive per 31 drives to serve as a spare for the system. A spare drive can replace a faulted drive in a storage pool if it matches the drive type of the faulted disk. Any unbound drive can serve as a spare, but Unity enforces the 1 per 31 rule. Note: Dell EMC recommends that a storage pool always has at least 10 percent free capacity to maintain proper functioning. Dell EMC recommends using fewer storage pools within Unity systems to reduce complexity and increase flexibility. It might be appropriate to configure multiple storage pools to: Separate workloads with different I/O profiles Separate pools where FAST cache is and is not active Dedicate resources to meet specific performance goals Separate resources for multitenancy All-flash pools All-flash pools provide the highest level of performance in Unity systems. Use an all-flash pool when the application requires the highest storage performance at the lowest response time. SAS Flash 3 or SAS Flash 4 drives are preferred for all-flash pools, as they provide higher capacities and lower cost per GB. Dell EMC recommends using only a single drive size and a single RAID width within an all-flash pool. You can use 1.6 TB SAS Flash 3 or SAS Flash 4 drives and configure them all with RAID 5 8+1, for example. Hybrid pools Hybrid pools contain more than one type of drive technology. In addition to flash drives, hybrid pools can contain SAS or near-line SAS (NL-SAS) drives. Hybrid pools typically provide greater capacity at a lower cost than all-flash pools, but with lower overall performance and higher response times. Use hybrid pools for applications that do not require consistently low response times, or that have large amounts of mostly inactive data. Storage Configuration Best Practices for SAP HANA TDI on Dell EMC Unity Storage Systems 9

10 Technology overview and considerations Note: Dell EMC recommends provisioning a flash tier in hybrid pools. The minimum recommended flash capacity is approximately five percent of the pool capacity. For more information, see the Dell EMC Unity: Best Practices Guide. Dynamic pools In Unity All Flash models running OE version 4.2.x or later, all new pools created in the Unisphere GUI are dynamic pools. New pools created in the Unisphere CLI and REST API are dynamic pools by default. Note: Dynamic pools are only supported on Unity All Flash models with Unity OE version 4.2 and later. For Unity All Flash models running OE version 4.2.x or later, you can create traditional pools using the Unisphere CLI or REST API. Dynamic pools implement advanced RAID technology. When creating a dynamic pool in Unisphere, the user selects the required RAID type. The RAID width is automatically selected by the system and depends on the number of drives selected at the time of pool creation. Table 3 shows the relationship between the RAID type, the RAID width, and the minimum number of drives required to create the pool. Table 3 shows only the smallest RAID widths supported and the minimum number of drives required to create them. For example, the smallest RAID 5 RAID width that the system supports is a 4+1. The smallest dynamic pool created with the RAID configuration is six drives. The minimum drive count includes the number of drives specified in the RAID width, plus an extra drive to satisfy the spare space requirements. Table 3. RAID requirements for dynamic pools RAID type RAID width Minimum number of drives How it is calculated RAID (4+1) +1 extra drive RAID (4+2) +1 extra drive RAID 1/ (1+1) +1 extra drive Note: For more information, see the Dell EMC Unity: Dynamic Pools Overview. Unlike traditional pools, dynamic pools do not require dedicated hot spare drives. Instead, space within each pool is reserved and can only be used to replace a failing or failed drive. After a dynamic pool is created and the drives are partitioned into drive extents, a number of drive extents are reserved and marked as spare space extents. Dynamic pools have the following advantages over traditional pools: Drives are not wasted, because there are no fixed spares. All drives in the system can be added to a pool. This prolongs the life of the drives in the pool, because the load is spread across additional drives. Rebuild times are usually much faster than with traditional pools. Because spare capacity for a dynamic pool is spread across multiple drives rather than 10 Storage Configuration Best Practices for SAP HANA TDI on Dell EMC Unity Storage Systems

11 Technology overview and considerations RAID protection concentrated in on a single hot spare drive, more drives contribute to the rebuilding process when a drive fails. Pools can usually be expanded based on the capacity required. For example, you can add one drive at a time to a dynamic pool, providing provisioning flexibility and cost savings. Unity applies RAID protection to the drives in a storage pool to protect user data against drive failures. The available RAID types are: RAID 1/0 Provides the highest level of performance from a given set of drive resources, with the lowest CPU requirements. Only 50 percent of the total drive capacity is usable. This RAID type is best suited for applications with fast or high processing requirements. RAID 5 Provides the best usable capacity from a set of drive resources, but with lower overall performance and availability than RAID 1/0. RAID 5 is best suited for transaction processing. RAID 6 Provides better availability than RAID-5 and better usable capacity than RAID 1/0, but has the lowest performance potential of the three RAID types. It is best suited for read-biased workloads, such as archiving and backup to drive. FAST VP FAST VP is an automated feature that optimizes disk utilization. It ensures that your data is distributed effectively across the various media types in a multi-tier pool. FAST VP defines three tiers of drive types: Extreme performance tierflash disks Performance tierserial-attached SCSI (SAS) disks Capacity tiernl-sas disks When a storage pool with multiple tiers is created on a hybrid Unity system with licensed FAST VP, block and file resources created on that storage pool are subject to FAST VP policies. FAST VP policies can specify where to place the initial data populated to a storage resourcethe highest tier or the lowest tier. As the data is manipulated, FAST VP relocates data across the tiers based on usage, as shown in Figure 4. Storage Configuration Best Practices for SAP HANA TDI on Dell EMC Unity Storage Systems 11

12 Technology overview and considerations Figure 4. FAST VP relocation Data that is accessed frequently is placed on the best-performing tier, while lessfrequently accessed data is moved to the high-capacity tiers. Data relocation is at a 256 MB granularity and can be a scheduled recurring event. Combined with FAST cache and the other multicore optimizations, FAST VP ensures that your disks are used efficiently. Table 4 describes the FAST VP tiering policy settings, which are defined at the dataresource level. This policy defines both the initial tier placement and the ongoing automated tiering of data during data relocation operations. When creating a FAST VPenabled storage pool, use the highest available tier for the data volumes on flash and auto tier for the log volumes on SAS. Table 4. Tiering policy information Tiering policy Corresponding initial tier placement Description Start High then Auto-Tier (default) Highest available tier Recommended setting. Sets the initial data placement to the highest-performing disks with available space, and then relocates portions of the storage resource's data based on I/O activity. Auto-Tier Optimize for pool performance Sets the initial data placement to a system-determined optimum setting, and then relocates portions of the storage resource's data based on the storage resource's performance statistics such that data is relocated among tiers according to I/O activity. 12 Storage Configuration Best Practices for SAP HANA TDI on Dell EMC Unity Storage Systems

13 Technology overview and considerations Tiering policy Corresponding initial tier placement Description Highest Available Tier Lowest Available Tier Highest available tier Lowest available tier Sets the initial data placement and subsequent data relocation (if applicable) to the highest-performing disks with available space. Sets the initial data placement and subsequent data relocation (if applicable) to the most cost-effective disks with available space. Storage efficiency The Unity platform offers a range of storage efficiency features that can help you maximize the utilization and performance of your system. Unity s operating environment was built with the capability of multicore processors and their increasing scale in mind. With the use of flash media in hybrid array configurations, FAST cache and FAST VP can ensure that data is readily accessible and is being stored in the proper location on the array. Lastly, host I/O limits can be implemented to manage host activity and control noisy neighbors. Multicore optimization A set of multicore optimizations is offered on the Unity system: Multicore cachewith multicore cache, read and write cache space is shared and dynamically manipulated based on the read/write activity served by the system. This ensures a proper distribution of cache resources to best serve incoming requests. The arrival rates of incoming requests are tracked and weighed against the ability of the back-end disks to write the data out of cache. Based on this information, multicore cache throttles arrival rates to avoid forced flushing. Multicore cache is fully automated. No user interaction is required to enable or manipulate the cache. Multicore RAIDMulticore RAID manages the RAID-based protection on storage pools. With multicore RAID, any unassigned disks are marked as potential spares for use in the event of a drive fault. If a drive becomes faulted, a potential spare is selected and becomes a permanent part of the RAID group. Multicore RAID can also move a disk within the physical locations of a system. For example, a disk can be moved from one enclosure to another to better balance activity between enclosures and buses. Both assigned and unassigned disks can be relocated within a five-minute window. Note that moving an assigned disk temporarily results in a degraded RAID group. Lastly, RAID 6 groups that suffer double drive failures employ a parallel rebuild to restore full redundancy as quickly as possible. Spares are selected and the rebuild process begins immediately following a drive fault. Unity file systems NAS servers NAS servers host file systems on the Unity storage system. NAS servers use virtual interfaces to enable host connectivity to SMB, NFS, and multiprotocol file systems, as well as VMware NFS datastores and VMware Virtual Volumes. Depending on what is enabled on the NAS server, SMB file systems and NFS file systems can be created either separately or in a multiprotocol configuration. File systems and virtual interfaces are Storage Configuration Best Practices for SAP HANA TDI on Dell EMC Unity Storage Systems 13

14 Technology overview and considerations isolated to a single NAS server, allowing for multitenancy over multiple NAS servers. NAS servers are hosted on a storage processor, and automatically fail over if the SP becomes faulted. Any associated file systems also fail over. File systems File systems are file-based storage resources that are hosted on NAS servers. They are accessed through shares, which can be provisioned for SMB or NFS access, providing access for Windows or UNIX hosts. Depending on what protocol is selected for your file system, only shares of that type can be provisioned. For example, if an SMB file system is created, SMB (not NFS) shares can be provisioned. To provision both SMB and NFS shares from a file system, use a multiprotocol file system. File systems can be extended and shrunk in size, and allocated space is automatically taken and reclaimed based on file system usage patterns. Finally, file systems can be configured with quotas to better regulate file system space usage. Tree quotas and user quotas are supported on file systems, and can be used in combination. Note: For more information about file systems, see EMC Unity: Unity File System - A Detailed Review. SAP HANA SAP HANA is an in-memory database. The data is kept in the RAM of one or multiple SAP HANA worker hosts. All database operations (reads, inserts, updates, or deletes) are performed in the main memory of the host. This feature differentiates SAP HANA from traditional databases, where only a part of the data is cached in RAM and the remaining data resides on disk. To ensure that the SAP HANA database can always be restored to its most recent committed state, persistent storage is used to provide a fallback in case of failure. The log captures all changes by database transactions (redo logs), and data and undo log information is automatically saved to disk at regular savepoints. Scale-up versus scale-out As an SAP-certified enterprise storage array for SAP HANA, Unity arrays can be used for both single-host (scale-up) and multihost (scale-out) systems in TDI deployments. In single-host environments, the database must fit into the RAM of a single server. Singlehost environments are preferred for online transaction processing (OLTP)-type workloads such as SAP Business Suite on SAP HANA. In multihost environments, the database tables are distributed across the RAM of multiple servers. Multihost environments use worker and standby hosts. A worker host is an active component that accepts and processes database requests. A standby host is a passive component. It has all database services running, but no data in RAM. It waits for a failure of a worker host so that it can take over its role, a process known as host auto-failover. Because the in-memory capacity in these deployments can be quite high, scale-out SAP HANA clusters are perfectly suited for online analytical processing (OLAP)-type workloads with very large datasets, such as SAP Business Warehouse on SAP HANA. HANA I/O patterns The HANA persistent devices have different I/O patterns. See the SAP HANA Storage Requirements White Paper for details. 14 Storage Configuration Best Practices for SAP HANA TDI on Dell EMC Unity Storage Systems

15 Technology overview and considerations Data volume Access to the data volume is primarily random, with various block sizes from small 4 K blocks up to large 64 M blocks. The data is written asynchronously with parallel I/Os to the data file system. During normal operations, most of the I/Os to the data file system are writes, and data is read from the file system only during database restarts, SAP HANA backups, host auto-failovers, or a column store table load/reload. Log volume Access to the log volume is primarily sequential, with various block sizes from 4K up to 1M blocks. SAP HANA keeps a 1 M buffer for the redo log in memory. When the buffer is full, it is synchronously written to the log volume. When a database transaction is committed before the log buffer is full, a smaller block is written to the file system. Because data to the log volume is written synchronously, a low latency for the I/O to the storage device is important, especially for the smaller 4 K block and 16 K block sizes. Similar to the data volume, during normal database operations, most of the I/Os to the log volume are writes, and data is read from the log volume only during database restarts, high availability (HA) failover, and log backups or database recovery. SAP HANA I/Os can be optimized for specific storage environments. See Optimizing file I/Os after SAP HANA installation for a description of the specific optimization required for the Unity arrays. SAP HANA certification for Unity Since SAP introduced the TDI deployment model, two certification scenarios have been used to test the performance of the SAP HANA persistence (data and log) and validate that the storage array meets the SAP KPIs for bandwidth (MB/s) and latency (microseconds): HANA-HWC-ES 1.0 and HANA-HWC-ES 1.1. HANA-HWC-ES 1.1 With SAP HANA 1.0 SPS 10 and higher, SAP introduced a new scenario for enterprise storage certifications. Version 1.1 now uses the underlying file system performance tool (fsperf) for file system performance validation. With fsperf, random I/O operations required additional resources and the KPIs could be achieved only with more disks (HDDs) or flash disks. The Unity all-flash and hybrid arrays for both the x00(f) and the x50f models have been certified using HANA-HWC-ES 1.1. All configuration and scalability recommendations in this document are based on this scenario. When revalidating Unity all-flash and hybrid arrays at a customer site, see SAP Note : Hardware Configuration Check Tool - Central Note. Storage Configuration Best Practices for SAP HANA TDI on Dell EMC Unity Storage Systems 15

16 Storage design recommendations for Dell EMC Unity arrays for SAP HANA Storage design recommendations for Dell EMC Unity arrays for SAP HANA SAP HANA production systems in TDI environments must meet the SAP KPIs. The following configuration recommendations apply to SAP HANA production systems deployed on Unity all-flash and hybrid storage arrays: SAN connectivity Virtual provisioning Unity scalability Capacity requirements Competing workloads SAN connectivity This section addresses general considerations that arise when you connect SAP HANA to Unity arrays. Host connectivity The SAP HANA nodes connect to the Unity arrays through a Fibre Channel SAN. SAN components require a minimum 8 Gb/s link speed, and the SAN topology must follow best practices for all redundant components and links. General SAN considerations The connectivity, which includes host HBAs, SAN ports, switches, and array front-end ports, requires careful planning. Unity provides multiple options for front-end connectivity through on-board ports directly on the DPE and optional I/O modules whose configuration must match between SPs. Fibre Channel I/O module ports use 16 Gb SFPs. 16 Gb FC is recommended for the best performance. All Fibre Channel ports can negotiate to lower speeds. The SAP HANA KPIs for TDI deployments require a maximum bandwidth of 400 MB/s per SAP HANA node. If, for example, ten nodes are connected in a SAN to a Unity array, a total bandwidth of 4000 MB/s is required. Assuming a 16 Gb/s front-end port provides approximately 1500 MBps bandwidth, four dedicated 16 Gb/s front-end ports are recommended to support ten SAP HANA nodes (4 x 1500 MB/s = 6000 MB/s), two on each SP, to facilitate high availability, load-balancing, and continued connectivity in the event of SP failure. While this maximum bandwidth requirement is only seen in the unlikely event that all nodes have this requirement simultaneously, it is one of the SAP HANA certification criteria that the storage arrays must sustain this peak workload. This requirement does not just affect the storage front-end configuration. In the example with ten nodes, the complete path through the SAN network must be configured to support the maximum bandwidth also. 16 Storage Configuration Best Practices for SAP HANA TDI on Dell EMC Unity Storage Systems

17 HBA ports Storage design recommendations for Dell EMC Unity arrays for SAP HANA Each HBA port (initiator) creates a path for I/Os between the host and the SAN switch, which then continues to the Unity storage. If a host only uses a single HBA port, it will have a single I/O path that serves all I/Os. Such a design is not advisable, because a single path does not provide HA and also risks a potential bottleneck during high I/O activity due to the lack of additional ports for load-balancing. A better design provides each SAP HANA server with at least two HBA ports, preferably on two separate HBAs. The additional ports provide more connectivity and also allow the Linux DM-MPIO to load-balance and failover across HBA paths. Unity storage processor connectivity for SAP HANA persistence Unity is a unified array providing block and file connectivity. Even though file storage can be used in an SAP HANA environment for different purposes (such as PXE-boot and shared file systems), the SAP TDI certification of the Unity series array applies to block Fibre Channel (FC)-attached SAP HANA persistence (data and log) only. Special attention is required when you connect SAP HANA nodes to the front-end FC ports of a Unity array. The Unity series provides flexible connectivity options through Dell EMC UltraFlex TM I/O modules for both the file for NFS/SMB connectivity and the block storage for FC and iscsi host connectivity. The block connectivity for the SAP HANA persistence requires the UltraFlex I/O FC module (block only) on each storage processor with 4 x 16 GB/s FC ports. Each Unity model supports up to two UltraFlex I/O modules per SP. Each SAP HANA node must connect to a minimum of two FC ports on each storage processor. Figure 5 shows the recommended FC port connectivity on an UltraFlex I/O module on each storage processor. Figure 5. Rear view of Unity DPE To achieve full I/O performance for SAP HANA production deployments, implement the following FC port requirements for a Unity array: Dedicate FC ports to SAP HANA and do not share them with non-sap HANA applications. Never connect a single HBA to both ports of the same I/O module. Balance FC ports used for SAP HANA across all available I/O modules. Use 16 Gb/s FC ports (recommended). Neither 10 Gb/s iscsi nor Fibre Channel over Ethernet (FCoE) have been validated for SAP HANA. Storage Configuration Best Practices for SAP HANA TDI on Dell EMC Unity Storage Systems 17

18 Storage design recommendations for Dell EMC Unity arrays for SAP HANA Virtual provisioning recommendations and data services Unity arrays can use Dell EMC Virtual Provisioning to provide capacity to an application. The capacity is allocated using Virtual Provisioning data devices and provided through storage pools based on the disk technology and RAID type. SAP HANA persistence (data and log) for production installations For SAP HANA production installations, Dell EMC recommends using flash drives for the SAP HANA persistence (data and log volumes) to meet the SAP HANA KPIs. Using flash devices provides benefits for SAP HANA production installations as follows: Sub-millisecond latencies for small block sizes on the log volume Reduced SAP HANA startup times when data is read from the data volume into memory Reduced SAP HANA host auto-failover times in scale-out deployments when a standby node takes over the data from a failed worker node Reduced SAP HANA backup times when the backup process needs to read the data from the data volume RAID protection Flash drives successfully meet the SAP HANA performance KPIs for the SAP HANA persistence. Dell EMC recommends the following RAID protection for SAP HANA production systems: Traditional pools Unity all-flash models with RAID on the extreme performance tier for both data and log devices. Unity hybrid models use RAID (flash) on the extreme performance tier for both data and log devices. If there is not enough flash capacity available, you can use a FAST VP enabled storage pool RAID (flash) on the Extreme performance tier for data devices and RAID (SAS) on the performance tier for log devices. A single RAID group RAID (flash), capable of supporting up to three SAP HANA nodes. Dynamic pools Supported with Unity OE 4.2 version or later on all-flash models Dynamic pools use the largest RAID width possible with the number of drives specified at the time of creation. Use RAID 5 for dynamic pools for both data and log devices. 18 Storage Configuration Best Practices for SAP HANA TDI on Dell EMC Unity Storage Systems

19 Storage pools Storage design recommendations for Dell EMC Unity arrays for SAP HANA Dell EMC recommends creating one storage pool for all SAP HANA data volumes and log volumes in a Unity array when using both an all-flash and a hybrid model. As of OE 4.2, for all-flash models, create one dynamic storage pool on the extreme performance tier (flash). For hybrid models, create one traditional all-flash pool or (optionally) a FAST VPenabled traditional storage pool across the performance tier (SAS) and the extreme performance tier (flash). SAP HANA persistence for SAP HANA nonproduction installations on Unity hybrid models Although the SAP performance KPIs do not apply to SAP HANA nonproduction installations, those installations are still critical components in an overall SAP landscape. Dell EMC recommends using the SAS drives for all SAP HANA nonproduction installations on the Unity hybrid models when you provision storage. SAP HANA installation (/hana/shared/) on Unity hybrid models When using NAS in Unity arrays to provide the NFS share for the SAP HANA scale-out systems, the NL-SAS or SAS drives are sufficient when you provision additional capacity for the /hana/shared on the Unity hybrid models. Operating system boot image on Unity hybrid models Using the NL-SAS or SAS drives for the OS boot image on the Unity hybrid models is sufficient. Unity compression In Unity OE version 4.1 and later, Unity compression is supported on THIN LUNs and can be enabled during the LUN creation process, or enabled and disabled at a later time. The storage compression rates achieved for the SAP HANA database are typically lower than for traditional databases. This is because the SAP HANA column store compresses automatically and optimizes the compression after any changes. For best performance, Dell EMC therefore recommends not enabling Unity compression for SAP HANA production installations. For more information on Unity compression, see the EMC Unity: Compression Overview White Paper. Unity scalability Use Table 5 and Table 6 to estimate the initial number of SAP HANA production nodes that can be connected. The guidelines in Table 5 and Table 6 are based on our performance tests on a Unity 400 model and a Unity 350F model using the SAP hwcct tool. The tests were executed without competing workloads. The SAP HANA node numbers listed in Table 5 and Table 6 are an initial guideline to help you determine the number of SAP HANA worker nodes that can be connected to the Unity array for an existing or planned SAP HANA production environment. The actual number of production SAP HANA nodes that can be connected in a customer environment might be higher or lower, depending on the workload. In customer environments, use the SAP HANA hwcct tool with scenario HANA-HWC-ES 1.1 to validate the SAP HANA performance and determine the maximum number of SAP HANA hosts on a specified storage array. Storage Configuration Best Practices for SAP HANA TDI on Dell EMC Unity Storage Systems 19

20 Storage design recommendations for Dell EMC Unity arrays for SAP HANA Dell EMC recommends running regular SAP HANA health checks to verify the performance of the underlying storage environment. SAP HANA configuration mini-checks are described in the following: SAP Note : SQL statement collection for SAP HANA SAP Note : SAP HANA I/O Analysis Access to these notes requires an SAP username and password. Table 5. Unity x00(f) models scalability for HANA production systems Model Number of SAP HANA worker nodes Dedicated 16 GB/s FC-ports per storage processor/array Unity 300 / Unity 300F Unity 400 / Unity 400F Unity 500 / Unity 500F Unity 600 / Unity 600F 5 2/4 10 3/6 12 3/6 16 4/8 Note: We determined the scalability of other Unity x00(f) models by extrapolating the Unity 400 test results using the performance characteristics of the other models. Table 6. Scalability of Unity x50f models for SAP HANA production systems Model Number of SAP HANA worker nodes Dedicated 16 GB/s FC-ports per storage processor/array Unity 350F 6 2/4 Unity 450F 12 3/6 Unity 550F 14 4/8 Unity 650F 18 5/10 Note: We determined the scalability of other Unity x50f models by extrapolating the Unity 350F test results using the performance characteristics of the other models. Capacity requirements Every SAP HANA node requires storage devices and capacity for the following: Operating system boot image SAP HANA installation (/hana/shared) SAP HANA persistence (data and log) Backup 20 Storage Configuration Best Practices for SAP HANA TDI on Dell EMC Unity Storage Systems

21 Storage design recommendations for Dell EMC Unity arrays for SAP HANA Note: The formulas for capacity sizing in the SAP HANA Storage Requirements White Paper are subject to change by SAP. Always check these formulas before you determine capacity requirements. Operating system boot image When the SAP HANA nodes boot from a volume on Unity (boot from SAN), the required capacity for the operating system must be included in the overall capacity calculation for the SAP HANA installation. Every SAP HANA node requires approximately 100 GB capacity for the operating system. This capacity includes space for the /usr/sap/ directory. When booting from a SAN, follow the best practices in the Booting from SAN section of the Dell EMC Host Connectivity Guide for Linux. SAP HANA installation (/hana/shared/) To install the SAP HANA binaries, as well as the configuration files, traces, and logs, every SAP HANA node requires access to a file system mounted under the local mount point /hana/shared/. In an SAP HANA scale-out cluster, a single shared file system is required and must be mounted on every node. Most SAP HANA installations use an NFS file system for this file system. Unity all-flash and hybrid arrays can provide this file system with the NAS option. The size of the /hana/shared/ file system can be calculated using the latest formula in the SAP HANA Storage Requirements White Paper. Version 2.10 of this document used the following formulas for calculation: Single node (scale-up): Sizeinstallation(single-node= MIN(1 x RAM; 1 TB) Multinode (scale-out): Sizeinstallation(scale-out) = 1 x RAM_of_worker per 4 worker nodes SAP HANA persistence (data and log) The SAP HANA in-memory database requires disk storage to: Maintain the persistence of the in-memory data on disk to prevent a data loss due to a power outage and to allow a host auto-failover, where a standby SAP HANA host takes over the in-memory data of a failed worker host in scale-out installations Log information about data changes (redo log) Every HANA node (scale-up) or worker node (scale-out) requires two disk volumes to save the in-memory database on disk (data) and to keep a redo log (log). The size of these volumes depends on the anticipated total memory requirement of the database and the RAM size of the node. To prepare the disk sizing, SAP provides several tools and documents, as described in the SAP HANA Storage Requirements White Paper. Version 2.10 (February 2017) of this document provides the following formulas to calculate the size of the data volume: Option 1: If an application-specific sizing program can be used: Storage Configuration Best Practices for SAP HANA TDI on Dell EMC Unity Storage Systems 21

22 Storage design recommendations for Dell EMC Unity arrays for SAP HANA Sizedata = 1.2x anticipated net disk space for data where net disk space is the anticipated total memory requirement of the database plus an additional 20 percent free space. If the database is distributed across multiple nodes in a scale-out cluster, the net disk space must be divided by the number of HANA worker nodes in the cluster. For example, if the net disk space is 2 TB and the scale-out cluster consists of four worker nodes, then every node must be assigned a 616 GB data volume (2 TB / 4 = 512 GB x 1.2 = 616 GB). If the net disk space is unknown at the time of the storage sizing, EMC recommends using the RAM size of the node plus 20 percent free space for a capacity calculation of the data file system. Option 2: If no application-specific sizing program is available, the recommended size of the data volume of a given SAP HANA system is equal to the total memory required for that system: Sizedata = 1 x RAM The size of the log volume depends on the RAM size of the node. The SAP HANA Storage Requirements White Paper provides the following formulas to calculate the minimum size of the log volume: Backup [systems 512GB ] Sizeredolog = 1/2 x RAM [systems > 512GB ] Sizeredolog(min) = 512GB HANA supports backup to a file system or use of SAP-certified third-party tools. Dell EMC supports data protection strategies for SAP HANA backup using Dell EMC Data Domain TM and NetWorker. Although an SAP HANA backup to an NFS file system on a Unity all-flash or hybrid array is possible, Dell EMC does not recommend backing up the SAP HANA database to the storage array where the primary persistence resides. If you plan to back up SAP HANA to an NFS file system on a different Unity array, refer to the SAP HANA Storage Requirements White Paper for details about sizing the backup file system. The capacity depends not only on the data size and the frequency of change operations in the database, but also on the backup generations kept on disk. Competing workloads When adding workloads to the Unity system, consider the reported CPU utilization rates as well as the capacity and IOP sizing. Brief spikes of high utilization are normal and expected on any Unity system. The Dell EMC Unity: Best Practices Guide provides details on sustained CPU utilization and recommended operating ranges that influence whether the system can accept additional workloads. In highly consolidated environments, HANA, as well as other databases and applications, competes for storage resources. The host I/O limits quality of service (QoS) feature can be used to control noisy neighbors and protect the HANA production system performance. Host I/O limits The ability to limit the number of IOPS serviced by the Unity system is known as host I/O limits. Host I/O limits can be applied on LUNs, VMware vstorage VMFS datastores, and their associated snapshots. Use host I/O limits to limit incoming host activity on the basis 22 Storage Configuration Best Practices for SAP HANA TDI on Dell EMC Unity Storage Systems

23 Storage design recommendations for Dell EMC Unity arrays for SAP HANA of IOPS, bandwidth, or both. You can enforce limits on individual resources, or you can share a limit among a set of resources. Host I/O limits can be effective in consolidated environments if an overload on the storage resources affects the performance of more critical applications, such as SAP HANA production installations. To protect the performance of SAP HANA production systems, consider configuring host I/O limits on LUNs, datastores of non-sap HANA applications, or SAP HANA nonproduction systems to limit the total IOPs or bandwidth, which might otherwise consume a large portion of the system s resources. Storage Configuration Best Practices for SAP HANA TDI on Dell EMC Unity Storage Systems 23

24 Configuring Unity storage for HANA using Dell EMC Unisphere for Unity Configuring Unity storage for HANA using Dell EMC Unisphere for Unity The Unity internal architecture eliminates complex configurations and tuning steps. You can use Dell EMC Unisphere for Unity to complete the integral storage configuration tasks required to: Create the SAP HANA hosts Create a storage pool: Traditional pool Dynamic pool Create a NAS Server Create a file system and NFS share Create SAP HANA volumes and map the volumes to the SAP HANA nodes Configure FAST VP Figure 6 shows the Unisphere for Unity interface that enables you to perform these tasks. Figure 6. Dell EMC Unisphere for Unity Use the step-by-step instructions in the following sections as an example. Creating a host Each SAP HANA node must have two host bus adapter (HBA) ports that are zoned to the FC ports of the Unity I/O modules. After the SAP HANA nodes are started, if the zoning is correct, the host initiators are visible to the Unity module. To create an SAP HANA host: 1. Select Access > Hosts in the left panel. The Hosts page appears. 24 Storage Configuration Best Practices for SAP HANA TDI on Dell EMC Unity Storage Systems

25 Configuring Unity storage for HANA using Dell EMC Unisphere for Unity 2. To add an SAP HANA host, click the plus sign in the upper left corner and select Host. The Add a Host screen appears. 3. Type a name for the new SAP HANA host and (optionally) a description of the host. Click Next. 4. On the OS and Network Address page, specify a host operating system and network address. Although the operating system information is not required, it allows for more specific configuration and troubleshooting instructions. The network address (name or IP address) is required to customize access to the NFS share. Click Next. 5. On the Select iscsi Initiators page: If you are using iscsi initiators, from the list of auto-discovered initiators select the iscsi initiators the host will use to access storage resources. If you do not find the initiator you want in the list, click Create Initiator to add it manually and then select that initiator from the list of manually added initiators. Click Next. If you are not using iscsi initiators, click Next. 6. On the Select Fibre Channel Initiators page, from the list of auto-discovered initiators (shown in Figure 7), select the FC initiators that the host will use to access storage resources. If you do not find the initiator you want in the list, click Create Initiator to add an initiator manually, and then select it from the list of manually added initiators. Click Next. Figure 7. Adding a Host Select Fibre Channel Initiators page 7. On the Review Host Configuration page, review all the information you entered for the SAP HANA host and then click Finish to create the host. Storage Configuration Best Practices for SAP HANA TDI on Dell EMC Unity Storage Systems 25

26 Configuring Unity storage for HANA using Dell EMC Unisphere for Unity Creating a traditional pool A pool is a set of disks that provide specific storage characteristics for the resources that use them. For example, the pool configuration defines the types and capacities of the disks in the pool. For physical deployments, the pool configuration also defines the RAID configurations. Dell EMC recommends creating one storage pool for all SAP HANA data volumes and log volumes in a Unity array when you are using either an all-flash model or a hybrid model. When using the all-flash model, create one storage pool on the extreme performance tier. When you use the hybrid model, create one traditional all-flash pool or (optionally) a FAST VP-enabled traditional storage pool across the performance tier (SAS) and the extreme performance tier (flash). Note: Traditional pools are supported on all Unity models. For Unity All Flash models running OE version 4.2.x or later, you can only create traditional pools using the Unisphere CLI or REST API. With Unity hybrid models, traditional pools are created in the Unisphere GUI. To create an all-flash storage pool for provisioning the HANA persistence on the Unity hybrid model: 1. Select Storage > Pools in the left panel. The Pools page appears. 2. To add a storage pool, click the plus sign in the upper left corner. The Create Pool screen appears. 3. Enter a name and (optionally) a description of the storage pool. Click Next. 4. On the Select Storage Tiers page (shown in Figure 8), select the required tier or tiers for the storage pool: Extreme performance tier Provides fast access times for resources demanding the quickest response time. Databases can achieve their best performance when using this tier. Performance tierprovides high, all-round performance with consistent response times, high throughput, and good bandwidth. This tier is appropriate for database resources accessed centrally through a network. Capacity tier Provides high storage capacity with generally lower performance. This tier is appropriate for storing large amounts of primarily static data (such as video, audio, and image files) for users and applications without strict performance requirements. 26 Storage Configuration Best Practices for SAP HANA TDI on Dell EMC Unity Storage Systems

27 Configuring Unity storage for HANA using Dell EMC Unisphere for Unity Figure 8. Creating a pool Select Storage Tiers page 5. Under Selected Tiers, change the RAID configuration, if required. 6. Click Next. The Select Amount of Storage page appears, as shown in Figure 9. Note: Flash drives are required to successfully meet the SAP HANA performance KPIs for the SAP HANA persistence. With a FAST VP-enabled traditional storage pool on the Unity hybrid model, Dell EMC recommends using RAID (flash) on the extreme performance tier for data devices and RAID (SAS) on the performance tier for log devices. Figure 9. Creating a pool Select Amount of Storage page 7. From the drop-down list, select the usable capacity required for the storage pool. Click Next. Storage Configuration Best Practices for SAP HANA TDI on Dell EMC Unity Storage Systems 27

28 Configuring Unity storage for HANA using Dell EMC Unisphere for Unity 8. Review all the information you entered for the storage pool, as shown in Figure 10, and then click Finish to create the storage pool. Figure 10. Creating a pool Review Selection page Creating a dynamic pool In Unity All Flash models running OE version 4.2.x or later, all new pools created in the Unisphere GUI are dynamic pools. New pools created in the Unisphere CLI and REST API are dynamic pools by default. Note: You cannot change the RAID type of a dynamic pool after it is created. Also, you cannot shrink a dynamic pool or change its storage characteristics without deleting the storage resources configured in the pool and the pool itself. You can add drives to expand the pool. To create a dynamic pool on All Flash models with Unity OE version 4.2 or later: 1. In the left navigation bar of the GUI, click Storage > Pools. The Pools page appears. 2. Click the plus sign in the top left corner. The Create Pool screen appears, as shown in Figure Enter a name and (optionally) a description for the new storage pool. Click Next. 28 Storage Configuration Best Practices for SAP HANA TDI on Dell EMC Unity Storage Systems

29 Configuring Unity storage for HANA using Dell EMC Unisphere for Unity Figure 11. Create Pool page 4. On the Tiers page shown in Figure 12, select Extreme Performance Tier and RAID 5 (the default) for the dynamic pool. Click Next. The Drives page appears, as shown in Figure 12. Figure 12. Select Storage Tiers page 5. Select the number of flash drives needed to support the amount of storage required. For example, on the 350F we selected18 flash drives to support six SAP HANA nodes. Click Next. Figure 13. Select Amount of Storage page Storage Configuration Best Practices for SAP HANA TDI on Dell EMC Unity Storage Systems 29

30 Configuring Unity storage for HANA using Dell EMC Unisphere for Unity 6. On the Review Your Selections page, as shown in Figure 14, review all the information you entered for the dynamic pool. Figure 14. Review Your Selections page 7. If you are satisfied that the information is correct, click Finish. Creating a volume and mapping to the SAP HANA node Each SAP HANA node requires two volumes for persistence, one for data and one for log. To create the SAP HANA volumes: 1. Select Storage > Block in the left panel. The LUNs page appears. 2. To create a LUN, click the plus sign in the upper left corner. The Create a LUN screen appears. 3. Enter a name and (optionally) a description of the new LUN. Click Next. 4. On the Configure Storage Characteristics page, select the pool in which to create the LUN. If there are multiple tiers in the storage pool, select a tiering policy and enter the required size of the LUN, as shown in Figure 15. Click Next. Note: The default LUN selection is THIN. Leave Compression unchecked for SAP HANA production installations. 30 Storage Configuration Best Practices for SAP HANA TDI on Dell EMC Unity Storage Systems

31 Configuring Unity storage for HANA using Dell EMC Unisphere for Unity Figure 15. Creating a LUN Configure Storage Characteristics screen Note: Use SAP HANA Storage Requirements to determine the final capacity of the data and log LUNs. In the following examples, we used 256 GB for the log LUN and 614 GB for the data LUN. 5. In the Select Host Access page, check the host that will have access to the newly created LUN, as shown in Figure 16. Click OK. Storage Configuration Best Practices for SAP HANA TDI on Dell EMC Unity Storage Systems 31

32 Configuring Unity storage for HANA using Dell EMC Unisphere for Unity Figure 16. Creating a LUN Select Host Access page 6. On the Summary page, review all the information you entered for the new LUN, as shown in Figure 17, and then click Finish to create a LUN that is visible to the SAP HANA host. 32 Storage Configuration Best Practices for SAP HANA TDI on Dell EMC Unity Storage Systems

33 Configuring Unity storage for HANA using Dell EMC Unisphere for Unity Figure 17. Creating a LUN - Summary Storage Configuration Best Practices for SAP HANA TDI on Dell EMC Unity Storage Systems 33

34 Configuring Unity storage for HANA using Dell EMC Unisphere for Unity Enabling FAST VP FAST VP is an automated feature requiring very little manual intervention. If sufficient flash capacity is not available, you can use a FAST VP-enabled storage pool RAID (flash) for data devices and RAID (SAS) for log devices to meet the SAP HANA performance KPIs. FAST VP enables the system to retain the most frequently accessed or important data on fast, high-performance disks and to move the less frequently accessed and less important data to lower-performance, cost-effective disks. For storage pools, FAST VP: Monitors the usage of the data in a tiered pool. Tiered pools are heterogeneous pools that are configured with multiple classes of disks (flash plus SAS or NL- SAS). Depending on the tiering policy, uses the monitoring statistics to relocate data chunks automatically, at a 256 MB granularity, to other tiers within the pool. For example, the Start High then Auto-Tier policy relocates data to the storage tier that is best suited for that data based on relative activity. Performs load-balancing across the disks in tiered and non-tiered pools. Note: FAST VP can use all supported disk types except for the SAS Flash 3 disk. To enable FAST VP: 1. In the Unisphere GUI, click the Update System Setting in the upper right corner. Under Software and Licenses > License Information, check that FAST VP is licensed. If not, you must acquire a license. 2. Select Storage Configuration > FAST VP and review the settings shown in Figure 19. You can change the Data relocation rate if required the default is Medium. 34 Storage Configuration Best Practices for SAP HANA TDI on Dell EMC Unity Storage Systems

35 Configuring Unity storage for HANA using Dell EMC Unisphere for Unity Figure 18. FAST VP settings 3. To modify the relocation schedule, click the Modify data relocation schedule link. The Modify data relocation schedule page appears, as shown in Figure 19. Figure 19. Modifying the data relocation schedule Storage Configuration Best Practices for SAP HANA TDI on Dell EMC Unity Storage Systems 35

36 Configuring Unity storage for HANA using Dell EMC Unisphere for Unity 4. Ensure that the Schedule data relocation checkbox is checked, and then select the desired time and days to perform the data relocation. Click OK, and then Apply. Creating a NAS server In an SAP HANA scale-out implementation, install the SAP HANA database binaries on a shared file system that is exposed to all hosts of a system under the /hana/shared mount point. A NAS server can provide access to the shared HANA file systems. To create a NAS server: 1. Select Storage > File on the left side. The File page appears. 2. To create a NAS server, first click the NAS Servers link and then click the plus sign in the upper left corner. The Create a NAS Server screen appears. 3. Enter a server name and select a pool. Click Next. The Configure NAS Server Address page appears, as shown in Figure 20. Figure 20. Configure NAS Server Address 4. Enter the following information for the NAS server: Ethernet Port IP address Subnet Mask/Prefix Length10 Gateway VLAN ID Click Next. The Configure Sharing Protocols screen appears, as shown in Figure Storage Configuration Best Practices for SAP HANA TDI on Dell EMC Unity Storage Systems

37 Configuring Unity storage for HANA using Dell EMC Unisphere for Unity Figure 21. Configure Sharing Protocols page 5. Select the Linux/Unix shares (NFS) checkbox and enable NFSv4. Click Next. 6. (Optional) On the Unix Directory Service page, configure NIS as the UDS for the NAS server. Click Next. 7. (Optional) On the DNS page, configure the DNS for the server. Click Next. The Review Your Selections page shown in Figure 22 appears. Figure 22. Review Your Selections page Storage Configuration Best Practices for SAP HANA TDI on Dell EMC Unity Storage Systems 37

38 Configuring Unity storage for HANA using Dell EMC Unisphere for Unity 8. If you are satisfied that the information is correct, click Finish to create the NAS Server. Creating a file system and NFS share Ensure there is a NAS Server configured to support the file system that you want (NFS) and a pool with enough available storage space. To create a NAS server: 1. Select Storage > File in the left panel. The File page appears. 2. Click the File Systems link and then click the plus sign in the upper left corner. The Configure the Protocols the File System Supports screen appears. 3. Select the NAS Server that was previously configured for SAP HANA. Click Next. The Provide a Name and Description page appears. 4. Enter a name and description for the file system. Click Next. The Configure the File System Storage Characteristics page appears, as shown in Figure 23. Figure 23. Configure the File System Storage Characteristics page 5. Select the pool in which to create the file system, and then enter the size of the file system required and the tiering policy requirements. Click Next. The Configure the Initial Share page appears, as shown in Figure Storage Configuration Best Practices for SAP HANA TDI on Dell EMC Unity Storage Systems

39 Configuring Unity storage for HANA using Dell EMC Unisphere for Unity Figure 24. Configure the Initial Share page 6. Check the NFS Share (Linux/Unix) and type a name for the share. Click Next. The Configure Access page appears. 7. To allow access to hosts, click the plus symbol in the Customize access for the following hosts page. The Select Host Access page appears, as shown in Figure 25. Figure 25. Select Host Access page Storage Configuration Best Practices for SAP HANA TDI on Dell EMC Unity Storage Systems 39

40 Configuring Unity storage for HANA using Dell EMC Unisphere for Unity 8. Select the Access Type required from the list box and check the hosts that need access to the NFS share. Note: For the hosts to be visible, a network address must be assigned to the host. Click OK and then click Next. The Summary page appears, as shown in Figure 26. Figure 26. Summary 9. Review the information you have provided. If you are satisfied that it is correct, click Finish. The file system and NFS share are created. 40 Storage Configuration Best Practices for SAP HANA TDI on Dell EMC Unity Storage Systems

41 Accessing Unity storage from the SAP HANA nodes Accessing Unity storage from the SAP HANA nodes The SAP HANA 1.0 database requires Linux SUSE SLES11 or later or Red Hat RHEL 6.5 or later on the SAP HANA nodes. The SAP HANA 2.0 database requires Linux SUSE SLES12 (or later) or Red Hat RHEL 7.5 (or later) on the SAP HANA nodes. To access the Unity block devices from the SAP HANA nodes, ensure that zoning is correctly configured based on SAN best practices. For more information, see the Dell EMC Host Connectivity Guide for Linux. Enabling native Linux multipathing (DM-MPIO) To access the block devices from the SAP HANA nodes, first enable native Linux multipathing. Follow the steps described in the Dell EMC Host Connectivity Guide for Linux to enable DM-MPIO on your operating system version. Figure 27 shows an example of a multipath.conf file. Figure 27. Sample multipath.conf file The SAP HANA persistent devices are visible on an SAP HANA worker host after a restart or a rescan (using the rescan-scsi-bus.sh command). To verify that all devices are present and that each device has the number of active paths you configured (as shown in Figure 28, type the following command: Multipath ll Figure 28. Sample Multipath -ll Storage Configuration Best Practices for SAP HANA TDI on Dell EMC Unity Storage Systems 41

42 Accessing Unity storage from the SAP HANA nodes Dell EMC uses the LUN UUID to identify the correct storage devices. To view the identifier of a Unity LUN, go to the Volume tab in the configuration workspace in the Dell EMC Unisphere for Unity. Note: Linux adds a preceding 3 to the storage UUID. XFS file system The XFS file system provides the best performance for both SAP HANA data and log block devices. To format a block device with the XFS file system, run the following command on the SAP HANA node: $ mkfs.xfs /dev/mapper/ a503e00690f af8 Note: Run this command for all block devices. If for some reason you must expand a file system, run the xfs_growfs command on the Linux host after you expand the volume on the Unity array. SAP HANA storage connector In an SAP HANA scale-out environment with worker and standby nodes, the SAP HANA storage connector for FC (fcclient) mounts and unmounts the devices to the SAP HANA nodes. In addition to mounting the devices, the storage connector also writes SCSI-3 persistent reservations (PRs) to the devices using the Linux sg_persist command. This operation, which is called I/O fencing, ensures that only one SAP HANA worker host has access to a set of data and log devices at a given time. SAP HANA global.ini file The storage connector API is controlled in the storage section of the SAP HANA global.ini file, as shown in Figure 29. The storage section of the file contains entries for the block devices with optional mount options. You can run the multipath ll command on the SAP HANA hosts to determine the worldwide identifiers (WWIDs) of the partition entries. Figure 29. Sample global.ini file 42 Storage Configuration Best Practices for SAP HANA TDI on Dell EMC Unity Storage Systems

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