all writer’s components residing on the target volumes to be restored, the restore
fails.
Before starting an instant recovery, Data Protector checks:
• Whether the data that is required for the components restore is available. If the
check fails, the instant recovery session also fails, ensuring that no data that does
not belong to the components is lost.
• If any changes that are not controlled by Data Protector happened in a disk array
environment (for example, the target volumes to be restored are presented to
some other system as it is recorded in the VSSDB, or the source volumes to be
replaced are not presented on the application system). If Data Protector detects
such changes (by comparing the state of the environment with data in the VSSDB),
the instant recovery session aborts. However, you can force the session to continue
by setting the OB2VSS_IGNORE_BACKUP_DISK_CHANGES and
OB2VSS_IGNORE_SOURCE_DISK_CHANGES omnirc variables to 1.
For Exchange Server 2007 writer specifics (prerequisites and limitations), see
“Microsoft Exchange Server 2007 instant recovery prerequisites and
limitations” on page 398.
Overview
Instant recovery restores data directly from a replica to source volumes. All data in
the replica is restored (regardless of selections during backup). For instant recovery
concepts, see the HP Data Protector zero downtime backup concepts guide.
Instant recovery can be performed:
• Using Microsoft Virtual Disk Service (VDS)
With this method, switch of a replica from the specified backup session with the
source volumes is performed. Information about the replica is deleted from the
VSSDB, therefore it is not possible to perform another instant recovery using that
replica. For more information about the switch of disks method, see “Switch of
disks” on page 394.
In case of the Data Protector XP integration, this type of instant recovery can be
performed if backup was run using the XP provider in the VSS compliant mode.
• Using a Data Protector disk array integration (HP StorageWorks EVA SMIS-S
Agent or HP StorageWorks XP Agent)
Integrating the Data Protector ZDB integrations and Microsoft Volume Shadow Copy Service392
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