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Configuring replication
25 Dell EMC SC Series: VMware Site Recovery Manager Best Practices | 2007-M-BP-V
5.8 SRM selectable snapshot
SRM selectable snapshot is a feature that is built into Unisphere Central. Because multiple methods of
replication are supported by SC Series storage, this feature determines whether the active snapshot or last
frozen snapshot is used when VMware SRM initiates a failover or test failover. There are four globally applied
configuration choices for SRM selectable snapshot:
Always use Active Snapshot (default): Uses the active snapshot (current, unfrozen state of the data
transferred to the destination).
Use Active Snapshot If Replicating Active Snapshot: Uses the active snapshot if Replicate Active
Snapshot is enabled for the replication, otherwise the last frozen snapshot is used.
Always use Last Frozen Snapshot: Uses the most current frozen snapshot that has been 100 percent
transferred to the destination.
Use Restore Point Settings: Uses the pre-configured settings for the restore point of the replication. If Use
Active Snapshot is not selected then the last frozen snapshot is used. This option allows granular selection of
the SRM Selectable Snapshot configuration on a per-volume-replication basis. The default Use Active
Snapshot configuration for each restore point is a cleared checkbox which translates to Use Last Frozen
Snapshot for the restore point.
The DSM default is to always use the active snapshot (the current unfrozen state) of the volume for SRM
purposes. The SRM selectable snapshot feature integrates only with certain SRM actions; in other actions it is
ignored. Table 1 outlines each scenario.
When SRM selectable snapshot is honored
SRM action
Recovery type
Activate recovery plan
Planned migration
Activate recovery plan
Disaster recovery
Test activate recovery plan
N/A