HP StorageWorks XP Remote Web Console Software - Manual (Page 42)

storing of snapshot data will not resume, and the status of some pairs may remain unchanged
when the power supply is switched again.
•
If information in the shared memory is lost after switching off the power supply
The storage system has a battery to maintain the information in the shared memory. However,
when a certain time elapses after the breaker is turned off, the battery will die and the
information in the shared memory will be lost. If information in the shared memory is lost after
switching off the power supply, the information about the pools and the XP Snapshot pairs is
erased. Therefore, you need to create the pools and the pairs again after the switch-on.
For information about the amount of time before the information in the shared memory is lost
when the breaker is turned off, ask HP technical support.
Installing and Uninstalling XP Snapshot
This section describes the procedure for installing and uninstalling XP Snapshot.
Installing XP Snapshot
The following steps describe the installation procedure for XP Snapshot:
1. Install additional shared memory for differential tables.
2. Install additional shared memory for the V-VOL management area.
3. Install XP Business Copy, which is the prerequisite program product for XP Snapshot.
4. Install XP Snapshot.
•
Call HP technical support to install additional shared memory for the V-VOL management
area. The shared memory for XP Snapshot and the shared memory for XP Thin Provisioning
must be installed separately.
•
Once you install additional shared memory for the V-VOL management area, you cannot
uninstall it partially. To uninstall the additional shared memory for the V-VOL management
area, you need to uninstall the whole shared memory that was added for the V-VOL
management area.
•
Skip Step 1 if the shared memory for differential tables is already installed.
•
Step 1 and Step 2 are interchangeable.
•
Skip Step 3 if XP Business Copy is already installed to the storage system.
•
Because 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 capacity for them.
Uninstalling XP Snapshot
The following steps describe the uninstallation procedure for XP Snapshot:
1. Delete all XP Snapshot pairs.
2. Delete all pools.
3. Delete all V-VOLs.
4. Uninstall XP Snapshot.
For detailed information about the procedures for deleting the pairs, pools, and V-VOLs, see
“Performing XP Snapshot Operations” (page 66) .
Starting XP Snapshot
After you have enabled the feature for the Remote Web Console and prepared for XP Snapshot
operations, you are ready to start up XP Snapshot. However, because XP Snapshot does not have
its own starting menu, you need to start up XP Business Copy and LUN Expansion (LUSE)/Virtual
LVI/LUN (VLL) in order to use XP Snapshot.
42 Preparing for XP Snapshot Operations