How LUN restoration from Snapshot copies works

When you restore a LUN from a Snapshot copy, the LUN reverts to the state it was in when the Snapshot copy was made: the restore operation overwrites all data written to the LUN since the Snapshot copy was made.

A LUN restore recalls a selected Snapshot copy. During a restore, the entire LUN drive is restored from the Snapshot copy. For a restore to succeed, no open connections can exist between the host machine (or any other application) and the files in the LUN.

Note: If it is necessary to restore a LUN from a Snapshot copy made before the LUN was resized, SnapDrive for Windows automatically resizes the LUN to the size of the Snapshot copy and performs the restore. Such a restore causes the loss of any data added to the LUN after it was resized, and it can damage virtual machines (such as Hyper-V VMs) or applications if they are running on the LUN during the restore.

About the Data ONTAP LUN clone split (rapid LUN restore) feature
SnapDrive uses the LUN clone split (rapid LUN restore) feature of Data ONTAP when restoring a LUN.
Restoring a LUN from a Snapshot copy
SnapDrive restores a LUN using the rapid LUN restore feature.
Checking LUN restore status
Check whether LUN restoration has completed by viewing the Restore Status field in the SnapDrive MMC.
About volume-based Snapshot copy restoration with SnapDrive
Use volume-based Snapshot copy restoration using the SnapDrive sdcli utility.

Parent topic: Managing Snapshot copies