Hitachi MK-97DF8018-00 - Manual (Page 46)

6–4 Using SnapShot
Hitachi Simple Modular Storage Copy-on-Write SnapShot User’s Guide
10.In the Group Assignment area, you have the option of assigning the
new pair to a consistency group. See Consistency Group (CTG) on page
1-6 for a description. Do one of the following:
- If you do not want to assign the pair to a consistency group, leave
the Ungrouped button selected.
- To create a group and assign the new pair to it, click the New or
existing Group Number button and enter a new number for the
group in the box.
- To assign the pair to an existing group, enter the consistency
group number in the Group Number box, or enter the group
name in the Existing Group Name box.
11.In the Split the pair ... field, do one of the following:
- Click the Yes box to split the pair immediately. A snapshot will be
taken and the V-VOL will become a mirror image of the P-VOL at
the time of the split.
- Leave the Yes box unchecked to create the pair. The V-VOL will
stay up-to-date with the P-VOL until the pair is split.
12.Click OK, then click Close on the confirmation screen that appears. The
pair has been created.
Update the V-VOL
Updating the V-VOL means to take a new snapshot. Two steps are involved
when you update the V-VOL: a resync of the pair and splitting the pair.
• Resyncing means that the P-VOL and V-VOL are re-synchronized. This
is necessary because the pair became out of sync when the pair was
split previously. After a pair split, no new updates are copied to the V-
VOL. When the V-VOL is updated, it is again updated and
resynchronized with the P-VOL, then split again.
• Splitting the pair is the taking of the snapshot. The V-VOL and the P-
VOL are the same at the time the split occurs. After the split the V-VOL
does not change. The V-VOL can then be used for tape-backup and in
operations by a secondary host.
To update the V-VOL
(Advanced users using CLI, see Updating SnapShot Logical Unit on page A-
6 .)
1. In Navigator 2 GUI, select the desired array, then click the Show &
Configure Array button.
NOTE: Add a Group Name for a consistency group as follows:
a. On the Pairs screen, check the box for the pair belonging
to the group.
b. Click the Edit Pair button.
c. On the Edit Pair screen, enter the Group Name then click
OK.