Hardware manual

Group Administration Snapshot management
11–3
See Modifying snapshot reserve settings for a volume on page 11-3.
About snapshot schedules
You can set up a schedule for creating snapshots of a volume or volume collection at a specific time or on a regular
basis.
Using a schedule can cause a large number of snapshots. Make sure yo
u have sufficient snapshot reserve. You can
set a limit on the number of snapshots the schedule can create. In addition, the size of the volume’s snapshot
reserve limits the number of volume snapshots.
Restriction: Yo
u cannot schedule snapshots for a template volume.
See Scheduling volume operations for information about creating a
snapshot schedule.
Modifying snapshot reserve settings for a volume
1. Click Volumes in the lower-left panel, then expand Volumes in the far-left tree, then select the volume name,
and then click
Modify snapshot settings.
2. In the Modify Snapshot Settings dialog box, modify the snapshot reserve, space recovery
policy, or the
snapshot space warning percentage.
If you change the snapshot reserve, the values in the
Pool Space table change. If the new snapshot reserve
value exceeds the capacity of the pool, the free pool space cell displays a negative value.
3. Click
OK.
Creating snapshots
You can create a snapshot of a single volume at the current time. Snapshot creation occurs immediately, with no
impact on volume availability or performance.
To create snapshots of multiple volumes at the same time, see Abo
ut snapshot collections on page 11-5.
Requirement: Before
you can create a snapshot, you must allocate snapshot reserve for the volume. See About
snapshot reserve settings on
page 11-2.
1. Click Volumes in the lower-left panel, then expand Volumes in the far-left tree, then select the volume name,
and then click
Create snapshot now.
2. In the Create Snapshot dialog box:
• Enter an optional description for the snapsho
t
(up to 127 ASCII characters).
• Select whether to keep the snapshot offline
(default) or set the snapshot online.
• Select whether to make the snapshot permission read
-write (the default) or read-only.
3. Click
OK.
The snapshot appears in the far-left panel,
under the volume name.