Hardware manual

Group Administration Snapshot management
11–11
Setting a snapshot online or offline
By default, a snapshot is offline. You can set a snapshot online, making it accessible to iSCSI initiators that match
one of the snapshot’s access control records.
If you set a snapshot offline, an
y current iSCSI connections to the snapshot are lost.
1. Click
Volumes in the lower-left panel, then expand Volumes in the far-left panel, then expand the volume
name, and then select the snapshot timestamp.
2. Click
Set snapshot online or Set snapshot offline.
3. Confirm you want to set the snapshot online or offline.
Modifying snapshot permission
A snapshot can have read-only or read-write permission.
If you write to a snapshot, it might no longer represent the contents of the
base volume at the time of snapshot
creation.
Requirement: To
change the permission of an online snapshot to read-only, first set the snapshot offline.
1. Click
Volumes in the lower-left panel, then expand Volumes in the far-left panel, then expand the volume
name, then select the snapshot timestamp, and then click
Set access type.
2. In the Select Access Type dialog box, select the permission for the snapshot.
3. Click
OK.
Allowing or disallowing multi-host snapshot access
In a shared storage environment, you must control computer access to iSCSI targets (volumes and snapshots),
because multiple computers writing to a target in an uncoordinated manner can result in volume corruption.
You can allow or disallow multi-host (shared) access to a snapshot.
If you disallow multi-host access to a snapshot,
only one iSCSI qualified name (IQN) can connect to the snapshot at one time. However, if you have a certain
environment, you might want to allow multi-host access to a snapshot. See Multi-host access to targets.
Note: To disable multi-host access to a snapshot, first disconnect all initiators from the snapshot except one. If
multiple
initiators have connections when you try to disable multi-host access, the operation fails, unless the
initiators have the same IQN.
1. Click
Volumes in the lower-left panel, then expand Volumes in the far-left panel, then expand the volume
name, then select the snapshot timestamp, and then click
Set access type.
2. In the Select Access Type dialog box, allow or disallow multi-host access.
3.
Click
OK.