HP StorageWorks Application Recovery Manager Administrator's Guide (T4395-96004, February 2008)

Restore
Overview
Chapter 4 55
HP StorageWorks Disk Array XP Considerations
• Restore depends on the XP hardware provider mode which was used
during backup. If the VSS compliant mode was used, you can restore
your data only using VDS. If the resync mode was used, you can
restore your data only using HP StorageWorks Disk Array XP.
• You can switch between the XP hardware provider modes between
different backup sessions using the same backup specification, but
this is not recommended if the specified number of replicas rotated is
more than 1 because restore will fail in the following situations:
— If you perform a backup in one mode and then the same backup in
the other mode, restore of the backup performed in the VSS
compliant mode (the "switch of disks" restore) will fail because the
relationship between the S-VOL and its P-VOL will be detected
from the other backup performed in the resync mode. This pair
relationship should not be removed during restore and thus a
switch of the source volume with the replica cannot be performed.
To restore such a backup, perform one of the following prior to
restore:
— Manually remove the S-VOLs that were created during
backups made in resync mode using the omnidbvss command.
—Set the variable OB2VSS_FORCE_INSTANT_RECOVERY in the
omnirc file and enable the restore option Retain source for
forensics in the GUI. This option must be selected to
preserve the pair relationship between the S-VOL and its
P-VOL created in the backup performed in the resync mode.
— If you perform restore using re-synchronization (the "copy of
replica data" restore) and the production source volume (P-VOL) is
not presented on the system, the restore is aborted. This can
happen if you have at least two backups created in different mode
and you performed the "switch of disks" restore before "the copy of
replica data" restore.
To restore such a backup, perform one of the following prior to
restore:
— Manually present the P-VOL on the application system.
—Set the variable OB2VSS_FORCE_INSTANT_RECOVERY in the
omnirc file.