Limitations; Instant Recovery Using Microsoft Virtual Disk Service - HP Data Protector A.06.11 Integration Manual

Limitations

• Instant recovery cannot be performed after a point-in-time recovery. To be able
to perform instant recovery, you first need to run backup with the instant recovery
options set.
• The number of replicas available for instant recovery is limited by Number of
replicas rotated, which sets the size of the replica set. You can view these replicas
in the GUI, in the Instant Recovery context by expanding Restore Sessions. Replicas
are identified by the backup specification name and the session ID. Other
information, such as time when a particular replica was created, is also provided.
Alternately, you can use the omnidbvss command to list sessions. For information
about omnidbvss, see the HP Data Protector command line interface reference.
• Concurrent instant recovery sessions utilizing the same backup system or the same
application system are not supported. Restores utilizing the same backup system
or the same application system must be performed serially.
• For instant recoveryof Exchange Server 2007 data to a different location, the
Microsoft Virtual Disk Service, HP StorageWorks EVA, and HP StorageWorks
Disk Array XP restore options are not available.
For additional Exchange Server 2007 writer limitations, see
Server 2007 instant recovery prerequisites and

Instant recovery using Microsoft Virtual Disk Service

The following instant recovery method is possible using VDS:
Switch of disks
With this method, the source volumes are unpresented and the target volumes (replica)
are presented in the place of the source volume. You can select to retain the old
source volumes. However, you cannot retain the replica and perform another instant
recovery from this replica.
If the restore session fails or is aborted, the VSS integration reverts the application
and backup environment back to the state in which they were before the instant
recovery.
Advantages
• Instant recovery is very fast.
• The original source volume can be retained after instant recovery.
limitations" on page 398.
Zero downtime backup integration guide
"Microsoft Exchange
393