Hitachi Copy-on Write SnapShot, User Manual

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Using SnapShot
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Hitachi Simple Modular Storage Copy-on-Write SnapShot User’s Guide
4. Existing volumes in the array are listed in the Primary Volume box.
Click the button next to the LUN that you want to back up, then click
Next . The Prepare Secondary Volume screen displays.
5. The system will create a secondary volume (SnapShot virtual volume)
in the array, with the same capacity as the selected P-VOL. In the LUN
box, use the default value (if present), or the enter an available logical
unit number. Then click Next . The Set Pair Parameters screen displays.
6. Use the default Pair Name , or enter a new name.
7. From the Pool Number drop-down box, select a data pool for the pair,
then click Next . The Confirm screen displays.
8. Click Confirm , then click Finish . The backup pair is created.
Create Pair Procedure
Unlike the backup wizard, this method allows you to set copy pace, assign
the pair to a group (and create a group), and automatically split the pair
after it is created.
1. In Navigator 2 GUI, select the desired array, then click the
Show &
Configure Array button.
2. From the Replication tree, select the Local Replication icon. The Pairs
screen displays.
3. Select the Create Pair button. The Create Pair screen displays.
4. In the Copy Type area, click the SnapShot radio button. There may be
a brief delay while the screen refreshes.
5. In the Pair Name box, enter a name for the pair.
6. In the Primary and Secondary Volume fields, select the primary and
secondary volumes that you want to pair. For SnapShot, the secondary
volume list contains the virtual volumes that have been previously set
up. Capacity of the V-VOL must be equal to the P-VOL capacity.
7. From the Data Pool Number dropdown list, select the data pool,
previously set up, that you want to assign to the pair.
8. Click the Advanced tab.
9. From the Copy Pace dropdown list, select the speed that copies will be
made. Copy pace is the speed at which a pair is created or
resynchronized. Select one of the following:
- Slow — The process takes longer when host I/O activity is heavy.
The time of copy or resync completion cannot be guaranteed.
- Medium — (Recommended) The process is performed continuously,
but the time of completion cannot be guaranteed. The pace differs
depending on host I/O activity.
- Fast — The copy/resync process is performed continuously and
takes priority. Host I/O performance is restricted. The time of
copy/resync completion is guaranteed.