HA-AP Hardware Appliance
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1 HA-AP Hardware Appliance Solution Whitepaper: High Availability SAN Appliance - Guarantees Data Access and Complete Transparency November 2013 Loxoll Inc. California U.S.A.
2 Protection against workflow disruption for small, mid-sized to large enterprises As IT professionals around the world know, High Availability (HA) refers to a system or component that is continuously operational for a desirably long length of time. Since a computer system or a network consists of many parts in which all parts usually need to be present in order for the whole to be operational, much planning for HA centers around backup and failover processing and data storage and access. For storage, a Redundant Array of Independent Disks (RAID) is one approach. A more recent approach is the Storage Area Network (SAN). Thanks to the advancements in these technologies, users are now able to share concurrent access to terabytes of data from anywhere on a Fibre Channel storage network. Key reasons causing workflow disruption: Hardware component break/fix Software code upgrade Network outage SAN I/O congestion System problem diagnosis and verification With these new capabilities have also come new demands for more user applications, and quicker turnaround times. Data availability have become mission critical. Protecting business workflow and guaranteeing data access to is no longer just an option. Fortunately, there is an answer: with the simple addition of Loxoll s HA-AP appliance, you can add highperformance, easy-to-manage, and bulletproof access to your SAN storage. The HA-AP solution is a sensible way to ensure SAN content is continuously protected and available, avoiding costly downtime or workflow interruptions. * Loxoll appliances are designed to failover in less than one second. Actual performance may vary with application, connection bandwidth, and server/storage configuration. Where failover timing is critical, Loxoll recommends testing for actual performance. HA-AP Appliance HA-AP is a purpose-built, solid-state, Fibre Channel appliance that routes and transparently mirrors storage content. The HA-AP solution architecture scales up in both performance and availability: each HA-AP appliance comes equipped with clustered dual activeactive engines for continuous data protection that move data at 600 megabytes per second. HA-AP s clustered operation also ensures you have access to your data in the event of a storage outage: two internal data paths to your mirrored storages mean no single point of failure can cause downtime. HA-AP appliance hardware mirroring instantly fails over* to alternate storage without business workflow interruption. This feature brings tier-1 storage functionality to tier-2 storage systems, an ideal choice for SAN customers.
3 Performance and Scalability Each HA-AP engine is an independent system, complete with its own real-time operating system and integrated hardware designed to move data at FC line speeds. HA-AP engines have been built for easy scalability: a modular, clustering architecture that enables performance and availability to be expanded in building- block fashion through the addition of more engines. For applications where high throughput is paramount, a dual-engine appliance is recommended for 4 FC RAID systems. For largescale operations, multiple HA-AP appliances can be used to create a large cluster for higher levels of performance and availability. Figure A illustrates how the HA-AP appliance (AKA Vmirror) creates an identical, block-for-block mirror of the Primary LUN: 1. Data is sent from host system to the HA-AP appliance 2. HA-AP appliance writes synchronously to Primary and Mirrored LUNs 3. To ensure LUN data consistency, the HA-AP appliance does not notify host system of completion until data has been written to both LUNs. Each LUN is an identical twin of the other, and in the event of a LUN failure, the HA-AP appliance continues to use the remaining available LUN for data access without affecting host system operation.
4 Because the HA-AP appliance uses high-speed, internal hardware routing to both read and write data, if the Primary LUN becomes unavailable, access is instantly shifted to the Mirror LUN. Since the Mirror LUN is identical to the Primary LUN, failover to the alternate LUN is instantaneous and imperceptible to the host system. Figure B illustrates how, in addition to simplifying failover, HA-AP appliance (AKA Vmirror) uses twin LUNs and hardware-driven FC access to accelerate the read performance of the SAN storage. 1. Host system makes read request to HA-AP appliance 2. HA-AP appliance alternately sends read requests from host systems to Primary and Mirror LUNs in round-robin fashion. 3. Ability to access two, rather than a single, LUN speeds up read response to host system(s). Host systems experience higher performance. In high data volume applications, the ability to read from two identical LUNs can offer a large performance advantage over single-lun reads, which can slow host systems access as multiple large files are read from a single LUN. Depending on the application and number of host systems, additional HA-AP appliances may be added to increase overall throughputs.
5 High Availability and Continuous Data Protection HA-AP appliance (AKA Vmirror) uses hardware mirroring between two FC RAID LUNs to replicate data, and provide instantaneous access to the Mirror LUN in the event that the Primary LUN becomes unavailable. As depicted in Figure C, to the host systems, the HA-AP-protected LUNs appear as a single, multipath, logical storage unit. In effect, the HA-AP connected storage pair behaves as a combined, fast, unbreakable LUN. To the host systems, a single or clustered HA-AP appliance appears as a single, active-active storage system, while from a physical standpoint, HA-AP-protected FC RAID arrays may actually reside in different physical locations providing an additional degree of protection in case disaster strikes at the primary storage site. Compared to a single-engine appliance, a dual-engine HA-AP appliance doubles throughput, and adds redundant data paths and components, ensuring that no single point of failure can cause downtime. To illustrate how HA-AP appliance achieves instantaneous failover, Figure D shows the sequence of events following an outage of the Primary LUN and/or HA-AP engine: 1. HA-AP engine and/or Primary LUN fail 2. The host system multipath driver senses the failure, issues a read to alternate HA-AP engine
6 3. HA-AP engine hardware routing sends read to the Mirror LUN. 4. Read continues uninterrupted. Progressive System Software Upgrade: With HA-AP appliance, the customer has an option to break the mirror LUNs as a frozen copy before major system software upgrades. The frozen copy would be used as a quick failback point when needed. Mirror LUNs would be re-synced after the upgrade is proven to reclaim the high availability configuration. High availability Made Easy HA-AP appliances make high availability installation and management a snap. Because mirroring is performed on the appliance rather than host systems, no installation of mirroring software or special drivers is required. Instead, installation is performed just once using HA-AP Admin, making installation as easy as a couple of mouse clicks. Once the mirrored arrays are activated, HA-AP-protected storage becomes immediately accessible to all connected host systems. HA-AP appliances save you more than just installation labor. Management is reduced because the HA-AP appliance shields host system operation from storage controller failures and the associated storage re-build process. In the event that a re-build is required, HA- AP appliance continues to provide access to the mirrored storage until the process is completed. When the primary storage is fully restored, HA-AP appliance shifts host systems access back to the original mirrored operation. All changes are automatic and fully transparent to connected host systems, and require no operator intervention.
7 Application 1: Grid Structured Tier-1 SAN for Enterprises Today s enterprises depend very heavily on the stability and integrity of the IT infrastructure that supports their daily operations, which in turn requires shared access to large stores of data. For storage systems, this translates into high throughput, concurrent data access, and implicitly, high storage system availability. Shown in Figure E below is a recommended configuration of HA-APenabled, grid structured, tier-1 storage area network that assures the high availability needs of an enterprise IT data center. HA-AP-Storage Building Block A basic building block that consists of a dual-engine HA-AP appliance and one or two pairs of FC RAID systems is recommended to achieve the best performance with highavailability. Additional HA-AP- Storage building block may be added for higher performance and capacity in large- scale SAN deployments. Each HA-AP/storage cluster is guaranteed 600 megabytes per second of sustained data throughput, even under any single point of component failure, or when offline for services, an important safeguard for deadline-driven work. Figure E. Grid Structured Tier-1 SAN
8 HA-AP Appliance Opt ons A compact, 1U rack mountable enclosure package holds up to two HA-AP engines and supports up to 8 mirrored pairs of FC RAID systems. HA-AP clustered engines, for high availability, may be configured in separate enclosures for distance volume mirroring. Application 2: Real-time SAN Replication over Campus Simple data backup can no longer meet enterprises demands on data protection and access availability. Backed data can be lost or damaged due to accidents, natural disaster, or human errors. While Loxoll s HA-AP appliance is designed HA solutions, because of its fabric-based hardware modular design, it is possible to for it to offer additional disaster recovery protection. Figure F illustrates a configuration for a typical shared storage environment, which incorporates a pair of HA-AP appliances (AKA Vmirror) replicating block data synchronously over Fibre Channel with the benefit of continuous critical data protection over distance, instant failover/failback, and enhanced read performance in multi-user access situations. In the event of a fire or flood damage at the primary site, the mirrored data at the secondary site is ready for use. Figure F. Real-time SAN Replication over Distance
9 The Best Price-Performance Solution Key Solution Benefits: Continuous data protection Continuous data access o No single point of failure o Instantaneous LUN failover Increased performance (20% - 60%) Simplified, fabric-based management o No downtime system maintenance o Flexible maintenance window Key Business Benefits: Assured business continuance Protection of digital assets Greater productivity Lower TCO in terms of capital and operating cost savings Loxoll s HA-AP architecture is extremely scalable. Our HA solutions are capable of supporting unlimited performance and capacity. Our price is unbeatable against any other same tier solutions with similar capabilities. Loxoll High Availability SAN Solutions guarantee the lowest cost, highest value, and best vendor support! For more information on Loxoll High Availability SAN Solutions, please contact: support@loxoll.com 9
10 HA8x4 Specifications Models Host OS Support Storage System Support Fibre Channel Specifications Serial Port Connectivity Ethernet Port Connectivity Operating Environment Mechanical Maximum Throughput Safety Standards EN Emission Standards HA8x4-1, Single-engine 1U appliance with 4x 8Gb/s FC ports HA8x4-2, Dual-engine 1U appliance with 8x 8Gb/s FC ports Any host operating system with multi-path driver that is compatible with standard SCSI-3 storage devices and configured to round-robin mode. Any FC storage system that is compatible with standard SCSI-3 host devices, also active-active or ALUA compatible, and is connected to HA-AP through FC switch. For storage device that requires host-type designation, assume a Linuxbased host. Quad 8Gb/sec Fibre Channel ports per engine module Protocol/Topology Standards: ANSI Fibre Channel (FC-PH, FC-PH-2, FC-PH-3, FC-PLDA, FC-FLA) ANSI Fibre Channel Arbitrated Loop (FC-PLDA, FC-AL, FC-AL-2) ANSI Fibre Channel Fabric (FC-FLA, FC-GS-2) Classes of Service: Class 3 Data Transfer Rate: 2, 4, or 8 Gb/sec Port Type: N(L)_Port Protocol: Serial Transmission Speed: baud Connector DB-9 Dual 1Gb/sec Ethernet ports Protocol: Transmission Control Protocol Internet Protocol (TCP/IP) Speed: 10/100/1000 Based-T Connector: RJ-45 Operating Voltage 100 to 240 VAC; 50 to 60 Hz 1.5A at VAC and 1A at VAC per engine module Weight HA8x4-1: 8.9 pounds (4.04 Kg) HA8x4-2: 12.8 pounds (5.81 Kg) Dimensions 1U rack-optimized 1.75 inches (4.445 cm) high 17.7 inches (44.96 cm) wide inches (32.50 cm) deep Dual Integrated power supplies with dual fan per engine module Front-to-back air pattern HA8x MB/sec, 50K IO/sec HA8x MB/sec, 100K IO/sec FCC Part 15B, Class A EN Class A, EN Class A, EN , EN , EN , EN , EN , EN , EN , EN , EN Loxoll Inc. Loxoll Inc. is a privately held company in California, USA. Loxoll specializes in the delivery of affordable high availability storage solutions on SAN. Rev. 1.6, All rights reserved, content contained herein is subject to change without prior notice. 10
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