Zero downtime backup and HP StorageWorks Continuous Access EVA

Data Protector A.05.10 - ZDB for EVA in the CA Configuration
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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. In this case, for a properly configured CA EVA, the data stream will be
localized to the primary site and will not load the SAN between the two EVA disk arrays, as long as the backup system is not part of the
same SAN.
During creation of the replica on the local disk array, the performance of the local disk array degrades. Thus, for the time of the replica
creation, the applications running on the application system are affected. You are recommended to use this variant of the ZDB tape
backup only if the backup media location does matter, or you want to have the backup media present on both sites, local and remote.
3.7.2 ZDB Tape Backup of the Destination Virtual Disks
The performance of ZDB tape backup of the destination virtual disks is limited by the network throughput between the remote disk
array and the tape device. Analogously, including the backup system and the tape device into the same network on the secondary site is
convenient for backup of the destination virtual disks. In this case, for a properly configured CA EVA, the data stream will be localized
to the secondary site and will not load the SAN between the two EVA disk arrays, as long as the backup system is not part of the same
SAN.
During creation of the replica on the remote disk array, the performance of the local disk array does not degrade. Thus, for the time of
the replica creation, the applications running on the application system are not affected. If the location of the backup media does not
matter, this variant of the ZDB tape backup is performance wise better than the ZDB tape backup of the source virtual disks.
3.7.3 Restore to the Source Virtual Disks
The restore performance is limited by the connection speed between the tape device from which the data is restored and the source disk
array.
3.7.4 Restore to the Destination Virtual Disks
Restore to the destination virtual disks is not possible because these disks cannot be mounted.