HP OpenView Storage Data Protector A.05.10 ZDB for HP StorageWorks Enterprise Virtual Array (EVA) in the CA Configuration White Paper Edition: August 2004 Manufacturing Part Number: n/a August 2004 © Copyright Hewlett-Packard Development Company, L.P.2004.
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Data Protector A.05.10 - ZDB for EVA in the CA Configuration Chapter 1: Introduction....................................................................................... 5 1.1 In This White Paper.....................................................................................................5 1.2 Before Reading On ......................................................................................................5 1.3 Terminology Conventions .........................................................
Data Protector A.05.10 - ZDB for EVA in the CA Configuration 5.2.1 EVA and Continuous Access Configuration Option...................................................................... 24 5.2.2 EVA in Continuous Access Configuration Specific Options......................................................... 24 Chapter 6: Restoring Data on CA EVA ............................................................ 27 6.1 Restoring to the Source Virtual Disks ...........................................................
Data Protector A.05.10 - ZDB for EVA in the CA Configuration Chapter 1: Introduction 1.1 In This White Paper This white paper describes the extension of HP OpenView Storage Data Protector A.05.10 which enables you to perform zero downtime backup using HP StorageWorks Continuous Access EVA. The purpose of the white paper is to provide you with the following: • Description of the backup functionality provided by this Data Protector extension. See Chapter 2, “Overview,” on page 7.
Data Protector A.05.10 - ZDB for EVA in the CA Configuration 1.3 Terminology Conventions Throughout the document, in order to make the text clearer and more readable, the following terminology conventions are used. Term Meaning Data Protector Data Protector A.05.
Data Protector A.05.10 - ZDB for EVA in the CA Configuration Chapter 2: Overview Until now, Data Protector enabled ZDB to be performed only on EVA+BC. On such an EVA, you can choose to perform any of the three snapshot backup session types: ZDB disk backup, ZDB disk/tape backup, and ZDB tape backup. If you back up the data using either of the first two backup session types, you can later restore it using instant recovery (IR). 2.
Data Protector A.05.10 - ZDB for EVA in the CA Configuration Chapter 3: Concepts 3.1 Prerequisites To be able to perform a ZDB session on CA EVA, the following prerequisites have to be fulfilled: • You must have the EVA Business Copy and Continuous Access licenses. For information on how to obtain these licenses, refer to the CA EVA documentation. • A VCS firmware version prior to 3.020 must be installed in the CA EVA HSV controllers. • A Command View EVA software version prior to 3.
Data Protector A.05.10 - ZDB for EVA in the CA Configuration Term Definition data replication group (DR group) a grouping of up to eight copy sets that have common characteristics and share a common CA EVA log source virtual disk a virtual disk that contains original data which is replicated to a destination virtual disk destination virtual disk a virtual disk that is the recipient of replicated data from a source virtual disk. failover In general, the meaning of this term is context-specific.
Data Protector A.05.10 - ZDB for EVA in the CA Configuration 3.4.3 Data Replication Group States Each DR group in CA EVA can be in one of the following states: "normal", "error", "warning", "unknown". Only when a DR group is in the "normal" or "warning" state, the data on the destination virtual disks is always consistent with the data on the destination virtual disks (of the same copy sets). Other states do not guarantee this consistency.
Data Protector A.05.10 - ZDB for EVA in the CA Configuration Cell Configuration for Backing Up Data by Replicating the Source Virtual Disks Cell Configuration for Backing Up Data by Replicating the Destination Virtual Disks In order to be able to restore data from the tape device to the source virtual disks, the application system should have access to the tape device from which the data will be restored.
Data Protector A.05.10 - ZDB for EVA in the CA Configuration 3.7 Performance Influences and Implications 3.7.1 ZDB Tape Backup of the Source Virtual Disks The performance of ZDB tape backup of the source virtual disks is limited by the network throughput between the local disk array and the tape device. As the tape device is connected to the backup system, including this system and the device into same network on the primary site is convenient for backup of the source virtual disks.
Data Protector A.05.10 - ZDB for EVA in the CA Configuration Chapter 4: Performing a Snapshot Backup on CA EVA Use the Data Protector GUI to create a filesystem or disk image ZDB backup specification for a backup session that will run on CA EVA configuration. After the backup specification is configured and saved, a zero downtime backup can be started using the Data Protector GUI or scheduled using the Data Protector scheduler. 4.
Data Protector A.05.10 - ZDB for EVA in the CA Configuration The procedure for configuring an EVA backup specification is described in the HP OpenView Storage Data Protector EVA/VA/MSA Integration Guide, chapter 3 Snapshot Backup, section Configuring an EVA Backup Specification. To configure a CA EVA ZDB backup specification, proceed as follows: 1. Perform the steps 1 and 2 of the referred procedure. 2. Specify the EVA-specific backup options: a.
Data Protector A.05.10 - ZDB for EVA in the CA Configuration Figure 3 - CA EVA-Specific ZDB Options Available for Backup of the Destination Virtual Disks c. Select other EVA backup options. For details, see Chapter 5, “EVA and CA EVA-Specific Backup Options,” on page 19. 3. Perform the steps 4 to 9 of the referred procedure. 4.2 Starting or Scheduling a CA EVA Snapshot Backup Use standard procedures for starting or scheduling a CA EVA ZDB session.
Data Protector A.05.10 - ZDB for EVA in the CA Configuration Chapter 5: EVA and CA EVA-Specific Backup Options 5.1 EVA Backup Options The following tables list common EVA backup options with the descriptions that apply when used for configuring a ZDB specification for CA EVA. 5.1.1 EVA Replica Storage Management Options Keep the replica storage after the backup Select this option to keep the replica storage version on a disk array after the ZDB tape backup session is completed.
Data Protector A.05.10 - ZDB for EVA in the CA Configuration Number of replica storages rotated Specify the number of replica storage versions you want to keep on a disk array. During every backup session, Data Protector creates a new replica storage version and leaves it on the local disk array (in case of the source virtual disks backup) or on the remote disk array (in case of the destination virtual disks backup) as long as the specified number is not reached.
Data Protector A.05.10 - ZDB for EVA in the CA Configuration 5.1.2 EVA Snapshot Management Options Vsnap Select this option to create snapshots of the source virtual disks (in case of the source virtual disks backup) or the destination virtual disks (in case of the destination virtual disks backup) without the pre-allocation of disk space.
Data Protector A.05.10 - ZDB for EVA in the CA Configuration Strict With this option selected, Data Protector attempts to create snapshots of the type selected by the Snapshot type option. If some of the existing snapshots in the corresponding replica storage pool are of a different type, the selected type of snapshots cannot be used. Such a backup session will be aborted. This is the default selection.
Data Protector A.05.10 - ZDB for EVA in the CA Configuration 5.1.3 EVA Mount Options Dismount the filesystems on the application system Select this option if you want the filesystem on the application system to be dismounted before a snapshot is created and remounted after a snapshot is created. A filesystem does not have the stop I/O functionality to flush the data from the filesystem cache to the disk and stop the I/O for the time of the snapshot.
Data Protector A.05.10 - ZDB for EVA in the CA Configuration 5.2 CA EVA Backup Options The following tables describe the EVA backup options that you can specify when configuring a ZDB backup specification for CA EVA. 5.2.1 EVA and Continuous Access Configuration Option If you are modifying a ZDB backup specification, the following option is available in the HP StorageWorks EVA property page of the Backup Options window.
This set of options is only available if the backup of the Destination vdisks option is selected. Advanced options Data Protector A.05.10 - ZDB for EVA in the CA Configuration Force backup when Log state is "Logging" Select this option to perform snapshot backup when the DR group that contains the virtual disk being replicated is in the "logging" state. Note that in this case, integrity of the backed up data is not guaranteed. For more information on the CA EVA log states, see “CA EVA Logs” on page 10.
Data Protector A.05.10 - ZDB for EVA in the CA Configuration Chapter 6: Restoring Data on CA EVA The data backed up in a CA EVA backup session can be restored to the application system’s virtual disks using the standard restore procedure. 6.1 Restoring to the Source Virtual Disks During restore, the backed up data is restored from the tape device to the source virtual disks, which reside on the local disk array.
Data Protector A.05.10 - ZDB for EVA in the CA Configuration Chapter 7: New omnirc Variables The ZDB for CA EVA extension introduces support for new environment variables that can be set in the \omnirc file on both the application and backup systems. You can use these variables to customize the operation of the Data Protector EVA agent in the CA EVA backup environment. Refer to the HP OpenView Storage Data Protector Administrator’s Guide for information on how to use the omnirc file.
Data Protector A.05.10 - ZDB for EVA in the CA Configuration Chapter 8: Troubleshooting For general troubleshooting of ZDB tape backup and restore sessions on EVA, refer to the Troubleshooting sections in the HP OpenView Storage Data Protector EVA/VA/MSA Integration Guide, in chapters 3 Snapshot Backup and 4 Snapshot Restore.
