Snapshot

To take a LUN snapshot:

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

  1. Select the LUN of which you want to take snapshots.
  2. Click Snapshot and choose Take a Snapshot.
  3. Enter the description for this snapshot.
  4. Choose either of the following snapshot types according to your needs:
  5. Click OK.

Note:

Terminologies:

To delete a snapshot:

  1. Select the LUN of which you have taken snapshots.
  2. Click Snapshot > Snapshot List.
  3. Select the snapshot you want to delete and click Remove.

Note:

To restore an LUN:

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

  1. Select the LUN you want to restore.
  2. Click Snapshot and choose Snapshot List.
  3. 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.

Note:

Retention Policy

This option provides an ideal solution to help you specify the maximum amounts of snapshot versions to save your volume space, but you may need to retain your snapshots for longer periods of time. There are a few things to note about Retention Policy:

Example 1:
If you want to keep daily snapshots for the past 3 months, weekly snapshots for the past 4 to 6 months, and monthly snapshots for the past 7 to 9 months, you need to input 0 for hourly snapshots, 90 for daily snapshots, 24 for weekly snapshots, 9 for monthly snapshots, and 0 for yearly snapshots.

Example 2:
If you want to keep hourly snapshots for the past 2 days, daily snapshots for the past week, weekly snapshots for the past month, and monthly snapshots for the past year, you need to input 48 for hourly snapshots, 7 for daily snapshots, 4 for weekly snapshots, 12 for monthly snapshots, and 0 for yearly snapshots.