HP Data Protector A.06.11 Integration Manual page 182

• The guest operating system – any other non-Microsoft guest operating system
that is supported by Hyper-V – is not VSS enabled.
• The guest operating system does not have Hyper-V VSS integration services
installed.
• The virtual machine to be backed up is turned off.
Before offline backup, the virtual machine is automatically suspended (if not
already) and resumed after the backup.
After restore of an offline backup session, the virtual machine is suspended,
regardless of the state it was in before the restore.
The advantage of offline backup is that virtual machines are restored to the state
they were in at backup time, including the state of applications running at the
time of backup. This is possible because a virtual machine is in a suspended state
during the backup.
Prerequisites
• For online backup:
• The guest operating system must have the Hyper-V VSS integration services
installed and should not use dynamics disks.
• The snapshot file (avhd file) needs to be configured on the same volume as
the virtual disk file (vhd file).
• The virtual machine to be backed up must be online.
• For offline backup, if the prerequisites for online backup are met, a virtual machine
to be backed up must be put in the offline or suspended state manually.
Limitations
• Cluster-aware backups are not supported.
• Only whole virtual machines can be backed up or restored.
• Backup of virtual machines configured to use physical disks is not supported.
• Hyper-V writer data backup is not supported using the XP VSS hardware provider.
Backup from a physical cluster node
When backing up from a cluster node consider the following:
• Offline backups trigger a failover.
During offline backups the virtual machine to be backed up is suspended for a
moment. The cluster server recognizes this as a failure and initiates the cluster
failover. To avoid such a failover, perform one of the following:
182 Integrating Microsoft Volume Shadow Copy Service with Data Protector