iSCSI Manager

Snapshot

To take an iSCSI LUN snapshot:

A snapshot of an iSCSI LUN is a point-in-time, read-only copy of an iSCSI LUN.

Select the iSCSI LUN of which you want to take snapshots.

Click Snapshot and choose Take a Snapshot.

Enter the description for this snapshot.

Choose either of the following snapshot types according to your needs:

Application consistent: This type of snapshot can only be taken when Synology Snapshot Manager is installed on your Windows server or VMware vCenter Server depending on your operating environment to communicate with DSM. When application-consistent snapshots are triggered on DSM, applications will be notified and flush all the data from memory to the LUN on which the snapshot is taken to guarantee data consistency.
Crash consistent: If no Synology Snapshot Manager is installed on either of your client, you can only capture crash-consistent snapshots of LUNs. When they are triggered, applications will not be notified to flush the data from memory to the LUN and therefore guarantee no data consistency.

Click OK.

To restore an iSCSI LUN:

Select a point-in-time snapshot to restore the data on an iSCSI LUN.

Select the iSCSI LUN you want to restore.

Click Snapshot and choose Snapshot Manager.

Select a snapshot to which you want to restore and click Restore.

To make a clone of LUN from snapshots:

Make a writable copy of LUN or LUN snapshot.

Select an iSCSI LUN snapshot from Snapshot Manager and click Clone.

If there is at least one connected iSCSI session associated with the LUN and is used by Windows Server or VMware ESXi Server, we recommend installing the Synology Snapshot Manager plug-in to avoid possible data inconsistencies. Otherwise, you must stop any applications and log off these sessions from the initiators before proceeding.
LUN snapshot, restore and clone functions are only available on iSCSI LUNs with storage acceleration commands.
If you took a snapshot or created a clone, and the status turned out to be Abnormal/Crashed, please delete this snapshot/clone and create another one.
All changes to a LUN after a snapshot was created will be lost when you restore LUN to this snapshot.
The functions including restoring iSCSI LUNs, cloning iSCSI LUNs, and taking and cloning iSCSI LUN snapshots are not available when a volume has less than 1GB of free space.