On Windows 2008 R2, VSS Shadow Copy can be enabled for SIOS Protection Suite-protected (shared or replicated) volumes. However, the following guidelines apply:
VSS snapshot images must not be stored on a SIOS Protection Suite-protected volume. Storing VSS snapshots on a SIOS Protection Suite-protected volume will prevent SIOS Protection Suite from being able to lock the volume and switch it over to another node.
When a SIOS Protection Suite-protected volume is switched or failed over, any previous snapshots that were taken of the SIOS Protection Suite protected volume are discarded and cannot be reused.
VSS snapshot scheduling is not copied between the SIOS Protection Suite servers. If snapshots are scheduled to be taken twice a day on the primary server and a switchover occurs, this schedule will not be present on the backup server and will need to be redefined on the backup server.
There is a slight difference in behavior when switching back to a server where snapshots were previously enabled:
If the volume is a shared volume, VSS snapshots must be re-enabled.
If the volume is a replicated volume, VSS snapshots are automatically re-enabled.
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