EMC Solutions for Backup to Disk EMC Celerra LAN Backup to Disk with IBM Tivoli Storage Manager Best Practices Planning

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1 EMC Solutions for Backup to Disk EMC Celerra LAN Backup to Disk with IBM Tivoli Storage Manager Best Practices Planning Abstract This white paper describes how to configure the Celerra IP storage system for optimal performance when used as a backup target with IBM Tivoli Storage Manager. November 2007

2 Copyright 2007 EMC Corporation. All rights reserved. EMC believes the information in this publication is accurate as of its publication date. The information is subject to change without notice. THE INFORMATION IN THIS PUBLICATION IS PROVIDED AS IS. EMC CORPORATION 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 EMC software described in this publication requires an applicable software license. For the most up-to-date listing of EMC product names, see EMC Corporation Trademarks on EMC.com All other trademarks used herein are the property of their respective owners. Part Number H4019 Best Practices Planning 2

3 Table of Contents Executive summary...4 Introduction...4 Audience... 4 Terminology... 4 Overview...4 Celerra architecture... 5 Data Mover... 5 Control Station... 5 Storage system... 5 Network... 5 Celerra data protection... 6 Celerra Replicator... 6 Disk-based backup solution...6 Backup-to-disk solution overview... 6 Backup performance... 6 Recovery... 7 Multistreaming... 7 Media reliability and data availability... 7 Overall IT efficiency... 7 IBM Tivoli Storage Manager...7 Tivoli Storage Manager architecture... 7 Tivoli Storage Manager progressive incremental backup and restore... 8 Implementation...9 Celerra configuration steps... 9 Tivoli Storage Manager setup...11 Add a server connection...11 Tivoli Storage Manager backup sequence Tivoli Storage Manager restore sequence Recommendations...17 Celerra configuration CLARiiON array configuration settings Tivoli Storage Manager settings and considerations Network settings Conclusion...19 References...19 Best Practices Planning 3

4 Executive summary Disk-based data protection solutions have become desirable and affordable because of the lower cost of Advanced Technology-Attachment (ATA) storage systems. As a complement to using tape for long-term storage, backup to disk is a powerful solution for rapid recovery of mission-critical data, and it yields significant benefits over traditional backup to tape. This white paper discusses the advantages of backup to disk and outlines best practices for using and configuring IBM Tivoli Storage Manager software with a Celerra IP storage system as the backup-to-disk target for Windows clients. Introduction The guidelines in this white paper consist of configuration and parameter settings for the Celerra IP storage system, IBM Tivoli Storage Manager, and Windows backup clients. It describes the Celerra architecture and the replication data protection feature available on the Celerra. With the steps outlined herein, setting up the environment for backup and restore operations is simple and quick. Audience The intended audience is IT planners, storage architects, and storage and backup administrators who are involved in IT backup strategies, or those who seek a context for the implementation and configuration of their backup-to-disk solutions using an IP network. Terminology ATA: Advanced Technology Attachment. ATA enclosure: CLARiiON disk-array enclosure with ATA disks. AVM: Automatic Volume Management. LAN: Local area network. Link aggregation: A high-availability feature based on the IEEE 802.3ad Link Aggregation Control Protocol (LACP) standard enabling Ethernet ports with similar characteristics to combine into a single virtual device/link with a single MAC address and potentially multiple IP addresses. MVM: Manual Volume Management. NIC: Network interface card. QoS: Quality of service. RAID 5: Data is striped across disks in large stripes. Parity information is stored so that data can be reconstructed if needed. One disk can fail without data loss. SAN: Storage area network. SPE: Storage processor enclosure. The chassis element containing the storage processors, power supplies, and fans. Host and Fibre Channel ports are located on the SPE. It has dual-shared power supplies and is always powered by a standby power supply. TSM: Tivoli Storage Manager. WAN: Wide area network. Overview The following sections provide an overview of the Celerra architecture and data protection features. Best Practices Planning 4

5 Celerra architecture The Celerra IP storage system (Celerra) is a network-attached storage server that enables clients on a network to store and retrieve files over the network. Dedicated file servers, like Celerra, offer high availability and disaster recovery options that are not commonly available with general-purpose servers. Backup operations can be done with little or no interruption to production file access. By making backups easier to manage, they are more likely to be performed on a regular basis. Celerra is made up of several key components the Data Movers, Control Station, storage system, and network. Additionally, the Celerra is available in two distinct configurations: integrated and gateway. The Celerra integrated platform consists of one or more Data Movers and a dedicated storage processor enclosure (SPE). The SPE manages the back-end CLARiiON disk arrays. The gateway Celerra also consists of one or more Data Movers and connects to an existing SAN storage system. Data Mover Data Movers transfer data between the storage system and the client computer. Administrators typically do not manage Data Movers directly; instead, they work with the Control Station that sends commands to the Data Mover. A Data Mover can be active or a standby for other Data Movers. Each Data Mover is independent and there is no communication between Data Movers. If a Data Mover fails, the Control Station manages the failover to the standby Data Mover, assuming a standby has been configured. Each Data Mover is connected to the storage system, Control Station, and network. Control Station The Control Station is a dedicated management computer that monitors and sends commands to Data Movers. It connects to each Data Mover and to the storage systems through the Data Movers. The Control Station can be connected to a public or private network for remote administration. After the Data Movers are booted, they do not depend on the Control Station for normal operation. In the unlikely event the Control Station fails, the Data Movers continue to serve files to clients. Storage system The storage system is an array of physical disk devices used by the Celerra. It contains one or more disk arrays. The storage system stores and retrieves blocks of data for the Data Movers and is made up of Fibre Channel or Serial ATA (SATA) disks. In a backup-to-disk environment, data is stored on Serial ATA disks. The Celerra system offers two options to allocate and manage the storage system: Automatic Volume Management (AVM) The AVM feature automatically creates and manages usable file system storage. File systems are created using system-defined or user-defined storage pools. System-defined storage pools are dynamic by default, and AVM adds or removes volumes automatically from the storage pool as needed. Manual Volume Management (MVM) MVM provides additional flexibility in creating and aggregating different volume types into usable file-system storage that meets required configuration needs. Manually creating and managing volumes provides greater control over the location of storage allocated to a file system. There are a variety of volume types and configurations from which to choose to optimize a file system s storage potential. Volumes can be divided, combined, and grouped to meet specific configuration needs. Network The network enables clients to communicate with the Celerra server. Each Data Mover has its own set of network connections. There are also network connections between the Data Movers and the Control Station. Each Data Mover has one or more network interface cards (NICs). Best Practices Planning 5

6 Celerra data protection This white paper describes a LAN backup-to-disk environment with a client/server model where the primary data is located on a Windows or UNIX client and a backup server functions as the administrator and manager of the backup procedure. The backup process stores the data in a Tivoli Storage Manager (TSM) volume that is mapped to a CIFS share or NFS mount on Serial ATA disks connected to the Celerra rather than on a tape drive connected to the backup server. The client data backed up to the Celerra can be further protected with the Celerra Replicator feature available on the Celerra. Celerra Replicator The Celerra Replicator is a powerful, easy-to-use asynchronous replication solution that creates a point-in-time copy of a Celerra file system. The Celerra Replicator is optimized for WANs and its management is fully integrated with the Celerra Manager. It was designed with disaster recovery in mind, and provides capabilities such as failover, reverse replication, incremental re-sync, and others. Data backed up to a Celerra can be replicated to a secondary Celerra for further protection and offsite storage. Disk-based backup solution This section provides an overview of a backup-to-disk solution and a description of the IBM Tivoli Storage Manager backup-to-disk architecture. It provides a sequence of steps to perform backup and restore functions. Backup-to-disk solution overview Traditionally, tape has been the cornerstone of backup and archiving strategies. Tape has become entrenched in the minds of IT decision makers as a symbol of data safety. If your data was on tape, it was presumed safe. Dislodging the incumbent solution would take a significant shift in the underlying assumptions. The emergence of Serial ATA disk drives provided that shift. Disk-based data protection solutions have become desirable and affordable because of the lower cost of ATA storage systems. As a complement to using tape for long-term storage, backup to disk is a powerful solution for rapid recovery of mission-critical data, and it yields significant benefits over traditional backup-to-tape with the promise of the following: Fast backups Rapid restores Near-term recovery of mission-critical data Greater reliability and predictability of the backup medium Significantly enhanced business continuance Disk-based backups do not replace tape but instead shift tape into an archival role. Today, EMC recommends adopting a backup-to-disk solution when backup and restore performance and data reliability are primary concerns. Backup performance IBM Tivoli Storage Manager users can back up data at the write speeds of the Celerra storage systems. Additionally, disk drives are random-access devices and can immediately start writing data. Tape technologies require positioning and respond to a minimal data stream by shoe-shining or excessive back and forth positioning. The shoe-shining motion necessary to position a tape is detrimental and causes tapes to wear out. Best Practices Planning 6

7 Recovery Data is recovered at the processing speed of the Celerra storage systems and is read in a contiguous manner that enables users to gain the benefits of protecting clients in parallel without sacrificing recovery performance. Tape mounting and unmounting delays are also eliminated. As a result, IBM Tivoli Storage Manager users experience significant improvement in recovery time from disk as compared to tape. Multistreaming Multistreaming improves aggregate performance by being able to read and write multiple streams of data to and from the same file systems simultaneously. Media reliability and data availability Media-specific errors, including those that can cause backups to fail, are minimized. Examples of these errors include faulty tape media and tape mounting failures. Disk-system RAID protection ensures data availability in the event of a disk drive failure. As a result, fewer full backups may be required; that would save network and CPU-processing cycles. Overall IT efficiency Tape handling is reduced or eliminated. Maintaining a set of tapes from tape libraries can be problematic and requires properly trained personnel. Disk does not require tape handling and positioning. Backup to disk also provides the ability to perform both backups and restores simultaneously. IBM Tivoli Storage Manager IBM Tivoli Storage Manager enables protection of your organization s data from failures and other errors by storing backup, archive, space management, and bare-metal restore data, as well as compliance and disaster-recovery data, in a hierarchy of offline storage. Because it is highly scalable, Tivoli Storage Manager can help protect computers running a variety of different operating systems, on hardware ranging from notebooks to mainframe computers and connected together through the Internet, wide area networks (WANs), local area networks (LANs), or storage area networks (SANs). It uses Web-based management, intelligent data move-and-store techniques, and comprehensive policy-based automation that are working together to help increase data protection and potentially decrease time and administration costs. Business needs can be met using the various types of backup and recovery strategies that Tivoli Storage Manager offers. These range from progressive incremental backup of files, sub-file backup, volume level backup to backup sets, open file backups, and online backup of databases and applications to bare machine recovery backups. This white paper highlights the progressive incremental backup strategy. Tivoli Storage Manager architecture IBM Tivoli Storage Manager is based on a client/server architecture. A Tivoli Storage Manager backup domain consists of one or more TSM servers, one or more TSM clients, and optionally, one or more TSM storage agents. The Tivoli Storage Manager server controls and directs all TSM operations. Backup management information is stored or managed by the TSM server including configuration information, parameters for client systems to be backed up, the index of files backed up from those clients, and a database of media volumes where backed up data is stored. Typically, a server hosts one or more backup devices (disk or tape). When a backup occurs, a TSM client sends data to the TSM server, which directs the data to the appropriate storage. The server receives metadata information about the files being backed up separately and makes appropriate entries in the client file index and media database. Best Practices Planning 7

8 TSM manages client backup data in increments. The backup data originates from a single client and may consist of a single file, directory, file system, or partition. TSM maintains a database of details about the files that are backed up from the clients, as well as a mapping to the volumes containing the backup data. The database facilitates the ability to locate and recover data rapidly. A Tivoli Storage Manager client is any system with data to be backed up, from desktop systems to large database servers. A client runs client software tailored to the operating system it uses. Normally, a client operates under the control of the TSM server according to the policies an administrator establishes. However, users on the client system can initiate backup and recovery actions as necessary. Select files can be backed up manually without waiting for regularly scheduled backups to occur. The simplest backup-to-disk configuration is one that involves a minimum of one or more TSM clients and one TSM server. The client backup data goes from the TSM client(s) to the server and is forwarded to the Celerra backup target as shown in Figure 1. TSM clients TSM server Celerra backup target LAN Backup Restore Figure 1 Backup and restore topology Tivoli Storage Manager progressive incremental backup and restore The standard method that Tivoli Storage Manager uses to back up and restore data is called progressive incremental backup. The terms differential and incremental are often used to describe backups and they usually have the following meanings: Differential - Backs up files that have changed since the last full backup. If a file changes after the full backup, the changed file is backed up again by every subsequent differential backup. All files are backed up at the next full backup. Incremental - Backs up only files that have changed since the last backup, whether that backup was a full backup or another incremental backup. If a file changes after the full backup, the changed file is backed up only by the next incremental backup, not by all subsequent incremental backups. If a file has not changed since the last backup, the file is not backed up. Tivoli Storage Manager takes incremental backup one step further. After the initial full backup of a client, no additional full backups are necessary because the server, using its database, keeps track of whether files need to be backed up. Only files that change are backed up. This means savings in resources, including the network and storage space. The first time an incremental backup is invoked, TSM backs up all the files and directories on the drives specified. This process can take a long time if there is a large number of files, or if one or more very large files must be backed up. Subsequent full incremental backups will back up only new and changed files. This allows the backup server to maintain current versions of files, without having to waste time or space Best Practices Planning 8

9 by backing up files that already exist in server storage. Depending on the storage management policies, the server might keep more than one version of the files in storage. The most recently backed up files are active backup versions. Older copies of backed up files are inactive versions. The server administrator determines how many backup versions Tivoli Storage Manager maintains for each file. Having multiple versions of a file permits restores of older (inactive) versions if the most recent (active) backup is damaged. Implementation The Celerra serves as target storage and provides file systems for backup operations. The Celerra is not aware that a backup to disk is in progress. From the Celerra point of view, it is simply providing a target file system for the requesting application. The Celerra system administrator must create one or more file systems containing the volumes used by the TSM application. The configurations described in this white paper are for a Celerra integrated with the industry-leading EMC UltraScale storage processor enclosure (SPE) that manages the back-end disk enclosures. The following sections describe how to: Configure the Celerra. Set up the TSM software in preparation for a backup-to-disk operation. Back up client data to a Celerra. Restore data from a Celerra to a client. Celerra configuration steps The steps outlined in this configuration are for CIFS shares only and do not cover NFS exports. As a target for a backup-to-disk application, a Celerra can be configured with a full shelf of ATA disks or a partial shelf of disks. The configuration steps highlighted in this section are for a Celerra configured with two disk shelves: one partially populated and one fully populated. The example uses the clarata_archive AVM storage pool and creates 4+1 RAID 5 groups. The clarata_archive storage pool was set up during the initial Celerra installation to use 4+1 RAID 5 groups. If the ATA disk shelves are fully populated, the clarata_archive storage pool can be set up to use 6+1 RAID 5 groups during initial installation. The Celerra Network Server Phase 3 Setup Guide provides more information about the initial storage configuration. RAID 5 configurations stripe data and parity across all the disks. Table 1 shows an example using 500 MB disks configured as RAID and 6+1 and the approximate amount of usable disk capacity and parity usage. Table 1 RAID 5 capacity planning Disk size Disk group type Number of disks per group type Usable data capacity 500 MB MB 500 MB 500 MB MB 490 MB Approximate parity usage The Celerra system administrator must create one or more file systems containing the volumes used by the TSM application. The following configuration steps are for a Celerra with one ATA enclosure and a Celerra with two ATA enclosures. The single ATA enclosure configuration contains 11 disks. In the dual enclosure example, the first enclosure contains 12 disks while the second enclosure contains 15 disks. Best Practices Planning 9

10 Celerra AVM is used to create the file systems. A single file system is created in the single ATA disk enclosure configuration, while two file systems are created in the dual ATA disk enclosure configuration. All Celerra configuration steps are performed using the Celerra Manager interface. For single and dual ATA enclosures, perform the following steps: 1. Create a CIFS server using the Celerra Manager Wizard: a. Select Wizards from the Celerra Manager navigation pane. b. Select Create a CIFS Server. c. Follow the Celerra Manager Wizard instructions for creating a CIFS server. 2. After creating the CIFS server, select Create a CIFS Share from the Celerra Manager Wizard menu. a. The first option is to select the CIFS Share Location. Select By selecting a file system first. b. Select the default Data Mover. c. Select Create File System. i. Select the same Data Mover as chosen during CIFS Server creation (step 1b). ii. Select Storage Pool. iii. Select the clarata_archive storage pool. This storage pool automatically creates two 4+1 RAID 5 groups and one hot spare. iv. Enter a name for the file system. v. Enter the size of the file system. vi. All remaining screens are optional. Click Next on each screen or enter desired information. After the file system is created, the Wizard returns to the CIFS Share creation. d. Select the file system created previously. e. Select the CIFS server created previously. f. Enter a CIFS Share name. g. Click Finish. For a dual ATA enclosure, select Wizards again and create a second CIFS server, file system, and CIFS share as described in the previous procedure. Upon completion, the dual enclosure disk layout contains the following RAID 5 groups: Enclosure 1: Two 4+1 RAID 5 groups and two hot spare disks Enclosure 2: Three 4+1 RAID 5 groups Best Practices Planning 10

11 Tivoli Storage Manager setup TSM functions are submitted using the Integrated Solutions Console. To prepare for backup and restore operations using TSM, perform the steps in this section. Figure 2 Add a server connection Add a server connection Add a server connection for each server to be managed through the Integrated Solutions Console (Figure 2). 1. From the Management Console, select Tivoli Storage Manager > Storage Devices. 2. In the Servers window, go to the Select Action listbox and select Add Server Connection. 3. Enter the requested information and click OK. Best Practices Planning 11

12 Figure 3 Create a storage pool A storage pool is a collection of storage pool volumes that are associated with one device class and one media type. To create a storage pool, do the following, as shown in Figure 3: 1. In the Servers window, select the server created in the Add Server Connection step. 2. Go to the Select Action listbox and select View Storage Pools. The Storage Pools for servername will display at the bottom of the screen. 3. Go to the Select Action listbox and select Create a Storage Pool. In the Create a Storage Pool window, do the following: a. Enter a storage pool name. b. Select Random access for the Storage pool type. Random access storage pools consist of volumes on disk. These storage pools always use the DISK device class. A volume in a random access storage pool is a fixed-size file that is created when a volume is defined for the storage pool. A volume will be added in the next step. c. Click Next. d. Select Create a new disk volume. e. Enter a Volume Name and Volume Size. f. Click Next. g. Click Finish. Best Practices Planning 12

13 Figure 4 Add a volume 1. In the Storage Pools for servername window, select the storage pool created in the previous step. The storage pool Properties window will be displayed. 2. In the storage pool Properties window, select Volumes. a. From the Select Action listbox, select Add Volume (Figure 4). b. In the Add Storage Pool Volume window, enter the fully-qualified volume name that corresponds to the CIFS share name created during the Celerra configuration. c. Enter the volume size. d. Accept the remaining defaults and click OK. Best Practices Planning 13

14 Figure 5 Create a policy domain A policy domain defines the policies for backup, archive and migration operations on client nodes assigned to the policy domain. To create a policy domain, do the following, as shown in Figure 5: 1. From the Management Console, select Tivoli Storage Manager > Policy Domains and Client Nodes. 2. In the Policy Domains window, go to the Select Action listbox and select View Policy Domains. 3. In the Select Action listbox, select Create a Policy Domain. a. Enter a policy name and select the number of Backup and Archive retention days and click Next. b. Select the Storage pool for backup data and the Storage pool for archive data from the listbox and click Next. c. Assign Client nodes now? Select the Yes radio button and click Next. d. Select View all client nodes and click Next. e. Select the client node for this policy domain and click Next. f. Review the policy domain summary and click Finish. Best Practices Planning 14

15 Figure 6 Create a management class In a policy domain, a management class contains the policy that specifies where client node data will be stored and how it will be managed. To create a management class, do the following, as shown in Figure 6: 1. From the Policy Domains window, select the policy domain created in the previous step. 2. In the Policy Domain Properties window, select Management Class. 3. From the Select Action listbox, select Create Management Class. 4. Complete the steps in the wizard to create a management class. 5. Click Finish. Best Practices Planning 15

16 Tivoli Storage Manager backup sequence All backup functions are submitted using the Backup-Archive GUI. To perform a backup operation using TSM, follow the steps in this section, as shown in Figure 7. Figure 7 Start a backup 1. Invoke the TSM Backup-Archive GUI from the Windows Start menu. 2. Select Actions > Backup. 3. Select Incremental (complete) from the listbox. 4. Select the files or folders to be backed up. 5. Click the Backup button to start the backup job. Best Practices Planning 16

17 Tivoli Storage Manager restore sequence All restore functions are submitted using the Backup-Archive GUI. To perform a restore operation using TSM, follow the steps in this section, as shown in Figure 8. Figure 8 Start a restore 1. Invoke the TSM Backup-Archive GUI from the Windows Start menu. 2. Select Actions > Restore. 3. Select the files or folders to be restored. 4. Click the Restore button. 5. Select the destination for the restored objects. 6. Click the Restore button. Recommendations The following sections provide configuration recommendations for the Celerra system, storage system, TSM software, network, and general recommendations regarding backup to disk. Celerra configuration Use the following Celerra configuration guidelines to ensure optimum backup-to-disk performance: Minimum Celerra version 5.5 or later. Best Practices Planning 17

18 Minimum FLARE version Release 22 or later. File-system layout In a backup-to-disk environment, Celerra 5.5 supports file systems up to 16 TB and a maximum of 32 TB of physical storage per Data Mover. Resource allocation from advanced features such as Celerra Replicator must be considered when evaluating backup-to-disk performance requirements. Performance could be impacted if Celerra Replicator is running in the background while a backup is taking place. Set the Celerra cifs.prealloc parameter to 6. When a CIFS client wants to write data, it asks the file server if there is enough space to write one byte of data (regardless of how much it wants to write). The file server responds with an amount of data the client can write before it must ask again (the prealloc size). The larger the prealloc size that the file server returns to the client, the less often the client has to ask the question. Fewer questions mean better performance. Allocation size is computed from a virtual block size allocation and real file size. The recommended value of 6 is equal to a 512 KB block size. A crucial component to making a backup to-disk decision is determining how much disk capacity is required to hold all the data to be backed up. Many factors play into this decision. The following are a few considerations: The amount of source data to be backed up. Backup method: Full or incremental. If full backups are performed regularly instead of incremental backups, more disk space is required to accommodate the volume of data. With Tivoli Storage Manager, the initial backup is a full backup while the others are incremental, thus saving backup resources such as network bandwidth and backup target disk space. Backup frequency: For example, more disk space is required if full backups are performed daily rather than weekly. Backup retention: How long will backup data be kept on disk prior to being deleted or moved to alternate storage for longer retention? The longer the data is kept on disk, the more disk capacity is required. Disk volume configuration: When using RAID 5, approximately 20 percent of the total disk capacity is allocated to parity data. The parity information provides protection should a disk failure occur. CLARiiON array configuration settings Use the settings in Table 2 to configure the CLARiiON storage array in a backup-to-disk environment. Table 2 CLARiiON array cache parameters for backup to disk Cache parameter Write cache Read cache Cache page size Value Maximum allowed Remaining memory 16 KB for larger I/Os Tivoli Storage Manager settings and considerations The following describes the TSM settings and best practices. Minimum TSM Version 5 release 4 or later. Avoid running disk-intensive applications, such as virus scanning, on the backup client when it is backing up or restoring files. A single client can concurrently back up multiple images as parallel backup streams. Using multiple parallel streams increases the aggregate throughput of the backup process and shortens the backup window for the client. Best Practices Planning 18

19 For optimal Tivoli Storage Manager backup and restore performance with a large number of clients, consider using Tivoli Storage Manager client compression. Compressing the data on the client reduces demand on the network and on the Tivoli Storage Manager server. By default, client compression is off. For maximum performance with a single fast client, fast network and fast server, turn compression off. In the case of multiple clients, slow network and slow server, turn compression on. Modify the client option file, dsm.opt, to change the compression value. Edit the client option file, dsm.opt, to map the location of the source data to a pre-defined management class by using the include statement. For example, map the source directory called sourcedata to a management class called demo in this way: INCLUDE.BACKUP C:\sourcedata\...\* DEMO Network settings Network performance is key to achieving optimum performance. The network must be tuned to avoid congestion and to guarantee that the backup window is not limited by network bandwidth. The following describes the network setting best practices: Use a dedicated backup network by configuring a separate network or through the use of QoS features that guarantee network bandwidth. If supported, enable jumbo frames on the backup client and the Celerra to enhance performance. Use link aggregation on the Celerra to increase the link speed beyond the limits of a single Ethernet port. EMC recommends using all available Gigabit Ethernet ports on the Data Mover in a link aggregation trunk for maximum throughput. Conclusion With these practices, optimum performance can be achieved using a Celerra system for backup to disk with Tivoli Storage Manager. References The following documents provide additional, relevant information. Access to these documents is based on your login credentials. If you do not have access to the content listed below, contact your EMC representative: Celerra Network Server Concepts Guide Configuring CIFS on Celerra Other referenced titles include the following: IBM Tivoli Storage Manager for Windows Server Administrator s Guide EMC Solutions for Backup to Disk EMC Celerra LAN Backup to Disk with IBM Tivoli Storage Manager Reference Architecture EMC Solutions for Backup to Disk EMC Celerra LAN Backup to Disk with IBM Tivoli Storage Manager Validation Test Report Best Practices Planning 19

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