HP XP20000XP24000 Disk Array - Manual (Page 32)

the pool capacity, which is as much as 42% of the V VOL capacity, will be used when you create the
file system.
Notes on Reducing the Pool Capacity
You cannot delete pool-VOLs that have previously been registered in a pool. To decrease pool capacity,
you need to create another pool or delete the pool-VOLs themselves, and recreate a pool.
Notes on Switching Off the Power Supply
Before you switch off the power supply while XP Thin Provisioning is running, stop the host I/O operations
first. When you switch off the power supply, the management table on the shared memory for XP Thin
Provisioning is backed up to the hard disk drive in the SVP. When you switch on the power supply, the
management table in the hard disk drive is recovered to the shared memory, so you can use the storage
system in the same status as when you switched off the power supply.
Installing and Uninstalling XP Thin Provisioning
General installation instructions are contained in the HP StorageWorks XP24000 Remote Web Console
User's Guide. This section contains an outline of the additional instructions that are specific to XP Thin
Provisioning.
Installing XP Thin Provisioning
The installation procedure for XP Thin Provisioning is described below.
1. Your HP service representative will install the additional shared memory for the V-VOL
management area. This is separate from the shared memory for XP Snapshot.
2. Make sure that you have sufficient license capacity for the actual V-VOL management area. For
specific instructions on installing license capacity, see the HP StorageWorks XP24000 Remote
Web Console User's Guide.
3. Add parity groups, and add the volumes that will be used as pool-VOLs. You can use volumes in
existing unused parity groups, in which case you would delete the path definition and perform
an LDEV format. For more detailed information about the LDEV format, see the HP StorageWorks
XP24000 Virtual LVI/LUN (VLL) and Volume Shredder User's Guide.
4. Create the pools. For specific instructions, see “ Creating Pools ” on page 44.
5. Create the V-VOLs. For specific instructions, see “ Creating V-VOLs ” on page 48.
6. Associate the V-VOLs to the pools. For specific instructions, see
“ Changing the V-VOL Information ” on page 54.
7. Define the path definition for the V-VOLs. For specific instructions, see the HP StorageWorks
XP24000 LUN Manager User's Guide.
Uninstalling XP Thin Provisioning
The uninstallation procedure for XP Thin Provisioning is described below.
1. Delete the path definition for the V-VOLs. For specific instructions, see the HP StorageWorks
XP24000 LUN Manager User's Guide.
2. Perform an LDEV format on the V-VOLs. For more detailed information about the LDEV format,
see the HP StorageWorks XP24000 Virtual LVI/LUN (VLL) and Volume Shredder User's Guide.
3. Release the association between the V-VOLs and the pools. For specific instructions, see
“ Deleting a Pool ” on page 46.
4. Delete all V-VOLs. For specific instructions, see “ Deleting a V-VOL Group ” on page 56.
5. Delete all pools. For specific instructions, see “ Deleting Pools ” on page 46.
6. Uninstall the XP Thin Provisioning license. For specific instructions on uninstalling the license
capacity, see the HP StorageWorks XP24000 Remote Web Console User's Guide.
32 Preparing for XP Thin Provisioning Operations