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
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-
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
.
Summary of Contents for Copy-on Write SnapShot
Page 8: ...viii Preface Hitachi Simple Modular Storage Copy on Write SnapShot User s Guide ...
Page 12: ...xii Contents Hitachi Simple Modular Storage Copy on Write SnapShot User s Guide ...
Page 42: ...5 4 Configuring SnapShot Hitachi Simple Modular Storage Copy on Write SnapShot User s Guide ...
Page 58: ...8 4 Troubleshooting Hitachi Simple Modular Storage Copy on Write SnapShot User s Guide ...
Page 68: ...A 10 Operations Using CLI Hitachi Simple Modular Storage Copy on Write SnapShot User s Guide ...
Page 89: ...1 Hitachi Simple Modular Storage Copy on Write SnapShot User s Guide ...