HP Application Recovery Manager software Integration guide (March 2008)

• The VSS/VDS hardware provider is configured for the same Command View on
both EVAs due to the hardware provider limitation, which can detect only one
EVA disk array.
Otherwise, the presentation of replicas to the backup system fails and consequently
the backup session fails.
Also in case where the application and backup systems are the same, ensure that
the VSS/VDS hardware provider is configured for the same Command View on both
EVAs. Otherwise, rotation and deletion of old replicas from other EVA cannot be
performed.
Note that if a failover of the production and copy databases happens, the backup
using the same backup specification as before failover will fail, since the backup
system is no longer connected to the disk array where the new replicas reside. In this
case, you can:
• Perform manual failover of the production and copy databases to enable the
same configuration as before the first failover.
• Create a new backup specification with the new backup objects specified.
• Change the backup system connection to the disk array where the new replicas
reside.
For restore limitation of this scenario, see “Limitations” on page 67.
Configuration check
With instant recovery, it is possible to selectively restore separate writer’s components
if they reside on separate source volumes. Instant recovery of separate components
also requires that the volumes with components data should not contain any other
data. The configuration check detects, whether there are more than one component
on the volume and whether there is any other data besides the component’s data.
At backup time, Application Recovery Manager can check whether the individual
components can be selectively restored using the instant recovery functionality. At
instant recovery time, Application Recovery Manager, can check whether the data
required for the components restore is available.
In case of the Microsoft Exchange Server Writer, it is checked, whether the whole
storage group should be restored, or whether the separate database stores can be
restored individually. In case of the MSDE Writer, it is checked, whether the user,
system, and log files are on separate volumes.
If the check fails for a component during the backup, you will not be able to select
this component for the instant recovery, you will need to recover all writer components.
If the check fails during the instant recovery, the instant recovery session will fail.
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