SnapDrive initiates SnapMirror replication automatically when a Snapshot copy is created, but you can also initiate SnapMirror replication manually.
Because SnapDrive automatically initiates SnapMirror replication after a Snapshot copy for a LUN on a SnapMirror source volume has been created, to initiate replication after a Snapshot copy has been created, you must either manually create a Snapshot backup copy or set up a schedule for automatic Snapshot backup copy creation.
Manual replication is not monitored by SnapDrive, so you do not know if replication succeeded.
The Update Mirror operation is initiated and a rolling Snapshot copy of the LUN is created. After the Snapshot copy has been created on the mirrored source volume, SnapDrive automatically updates the mirrored destination volume.