HP StorageWorks XP Remote Web Console Software - Manual (Page 20)

2. Install additional shared memory for the V-VOL management area.
When using an XP10000/SVS200, you do not need to install additional shared memory. You
only need to define shared memory for the V-VOL management area.
3. Install XP Business Copy, which is a prerequisite for XP Snapshot.
4. Install XP Snapshot.
NOTE:
•
Contact your HP account support representative to install additional shared memory for the V-
VOL management area.
• After installing additional shared memory for the V-VOL management area, you cannot partially
uninstall it. To uninstall additional shared memory for the V-VOL management area, you must
uninstall the entire shared memory added for the V-VOL management area.
• Skip step 1 if shared memory for the differential tables is already installed.
• Note that step 2 and step 3 are interchangeable.
• Skip step 3 if XP Business Copy is already installed on the array.
• Since the total capacity of XP Snapshot P-VOLs and pools will be considered as the capacity used
by XP Snapshot, you need to purchase enough license for them.
Uninstalling XP Snapshot
1. Delete all XP Snapshot pairs.
2. Delete all pools.
3. Delete all V-VOLs.
4. Uninstall XP Snapshot.
For more information about deleting pairs, pools, and V-VOLs, see
“
Snapshot XP operations ” on page 41.
Calculating the number of XP Snapshot pairs you can create
The number of XP Snapshot pairs you can create for an array depends on the number of differential
tables, V-VOL management area's shared memory capacity, or number of pair tables. To calculate
the number of XP Snapshot pairs you can create, first use the number of differential tables, then use
the V-VOL management area's shared memory capacity, and finally use the number of pair tables.
Then compare the three results. The smallest value is the maximum number of XP Snapshot pairs you
can create for the array.
Using the number of differential tables
You can use a maximum of 13,652 differential tables for an array if additional shared memory is
not installed. You can use a maximum of 30,718 differential tables if additional shared memory is
installed. To calculate the number of XP Snapshot pairs you can create, calculate the number of
differential tables required for the XP Snapshot pair and compare it with the number of differential
tables for the whole array. In addition to XP Snapshot, the following software products use differential
tables in the array:
Requirements for XP Snapshot operations 20