Detailed Backup Application Guidelines For Vls; Hp Data Protector; Data Protector General Guidelines - HP StorageWorks 12000 - Virtual Library System EVA Gateway Manual

5. Create an echo copy pool for the VLS2 replication library, with the library on VLS1 as the source.
Automigration will automatically create the replicating virtual cartridges on VLS1 in the spare
slots configured in step 1. During the automigration window you created, backups already copied
to replicating virtual cartridges on VLS1 will automatically be copied over to VLS2. If you back
up to a non-automigration tape in VLS1, then nothing else happens. To the backup application,
there is just one target library, though it contains both replicating and non-replicating tapes. It is
easy to put the replicating tapes into a different media pool in the backup application, and simply
configure the backup jobs to use either the replication media pool, or the non-replication media
pool. In either case, all the backup jobs go to the one, shared destination library.
NOTE:
For cross-replication you can create the reverse configuration. For example, create another large
library on VLS2 for its backups, and create a small replication library on VLS1 that is visible to the
back-end ports of VLS2.

Detailed Backup Application Guidelines for VLS

To achieve full performance benefits from the VLS, you may need to modify your enterprise backup
application configuration (for example, to take advantage of the fact that you can create many more
virtual tape drives than a physical tape library holds). If you have enabled deduplication, you may
need additional changes in your enterprise backup application to take full advantage of this capacity
optimization technology. Follow these guidelines before you begin deduplicating your data or some
data may not deduplicate efficiently.

HP Data Protector

This section includes both general and deduplication guidelines as well as other useful information
for HP Data Protector.

Data Protector General Guidelines

The following Data Protector guidelines apply to a VLS regardless of whether deduplication is enabled
or disabled:
• Tape block size: set the tape block size to 256 KB in the Drive Properties of the virtual tape drives
configured in Data Protector.
• Multiple paths to tape devices: in an environment with shared tape devices, there may be "Mul-
tiPath" devices within Data Protector (where there are both direct and indirect paths to the same
shared tape drive). To ensure optimal performance, verify that the direct path is used for backups.
• Data Protector media pool policy: the recommended media pool policy is "Loose" and "Append-
able." This prevents dedicating specific cartridges to specific backup jobs which results in inefficient
media usage and can also cause significant impact to VLS deduplication because it does not
consistently fill tapes.
• Disable multiplexing: set the concurrency to 1 (default is set in the Drive Properties, and can also
be set in the backup specifications), because multiplexing is not recommended for virtual libraries
due to the performance impact on restores and on deduplication. Because you can create addi-
tional drives easily in the virtual library and allocate them to Media Agents as necessary, sufficient
backup streams can be concurrently written without requiring multiplexing.
• Disable client backup compression.
194 Virtual Library Systems