Restoring From Disk Backup Device; Restoring From Backup Application-Created Tape Copy; Restoring From The Replication Target; Performance Bottleneck Identification - HP StorageWorks 12000 - Virtual Library System EVA Gateway Manual

Restoring from Disk Backup Device

Restore from the VLS or D2D is performed in the same way that restore from tape is done. Simply
direct your backup application to do the restore.
NOTE:
A restore from one tape can be performed at the same time as a backup to a different tape.

Restoring from Backup Application-created Tape Copy

The format of physical tapes used in the VLS and D2D environments is the same as the format in
environments not using a virtual tape library. To restore from tape, place the tape in a library or drive
that the host has access to and restore.
• Time to retrieve media is a factor in recovery time. Depending on the location of your vault and
the media management within the vaulting process, retrieval time can be a key part of recovery
time.
• Recovery from tape can be slower than recovery from disk.

Restoring from the Replication Target

Consider a use case after a site disaster where the local VLS or D2D device is unavailable and the
restore must be performed from the replication target device instead. There are three main method
of performing disaster recovery restore from a replication target:
• Restore directly from target device.
The replicated cartridges in the target device are all native format (so they can be restored directly
by a backup application). After presenting the replication target to a replacement backup applic-
ation and restoring its media database, you can restore your servers from the VLS or D2D device.
See Restore Directly from the VLS Target Device
• Restore over LAN/WAN.
This option is where some or all of the source device is rebuilt by restoring the replicated cartridges
over the LAN/WAN back from the target to the source. In the VLS, this is a wholesale (non-dedu-
plicated) restore so can only restore a subset of the source device such as the last backup set. (See
Restore the VLS over the
can rebuild the entire source device. (See
• Reverse tape initialization.
This option is where the replicated cartridges on the target device can be exported to physical
tape which can then be imported back into a new source device to rebuild it. This is currently only
supported on D2D devices. (See

Performance Bottleneck Identification

In many cases, backup and restore performance using the VLS or D2D is limited by external factors.
For example, performance is affected by the speed at which data can be transferred to and from the
source disk system (the system being backed up), or by the performance of the Ethernet or Fibre
Channel SAN link from the source to the VLS or D2D. To locate bottlenecks in the system, HP provides
some performance tools which are part of the Library and Tape Tools package available at
www.hp.com/support/tapetools.
LAN/WAN.) In the D2D, this is a deduplicated reverse replication so
Reverse Replication on the
Reverse Tape Initialization on the
HP StorageWorks VLS and D2D Solutions Guide
and Restore Directly from the D2D Target
D2D.)
D2D.)
Device.
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