HP Application Recovery Manager software Integration guide (March 2008)

Data consistency
The filesystem backup does not guarantee application data consistency, only filesystem
consistency. Application data consistency can be achieved only by using supported
application writers, such as Microsoft Exchange Server 2003 writer.
Backup with the EVA hardware provider
There are three replica types available when backing up using the EVA hardware
provider:
• Standard snapshot
• Vsnap
• Snapclone
However, in the GUI, you can select only between snapshot and snapclone. When
you select snapshot replica type, standard snapshot is created by default. For instant
recovery, only snapclone is available. For more information, see
“Snapshot replica” on page 45.
Backup with the XP VSS hardware provider
There are two configuration modes available for the backup with the XP VSS hardware
provider:
• VSS Compliant Mode
When the XP provider is in the VSS compliant mode, the source volume (P-VOL)
and its replica (S-VOL) are in simplex, unpaired state after a backup. Therefore
the number of replicas (S-VOLs per a P-VOL) rotated is not limited. Restore from
a backup in such a configuration is possible only by switching of the disks.
• Resync Mode
When the XP provider is in the resync mode, the source volume (P-VOL) and its
replica (S-VOL) are in a suspended mirror relationship after a backup. The
maximum number of replicas (S-VOLs per a P-VOL) rotated is three provided that
MU range is 0-2 or 0, 1, 2. Restore from a backup in such a configuration is
possible only by re-synchronization of an S-VOL with its P-VOL.
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