HP XP Racks - Manual (Page 132)

18. In the Buffer Space for Tier relocation text box, enter an integer value from2 to 40 as the
percentage (%) to set for each tier.
The default value is 2%.
19. Click Add.
The created pool is added to the Selected Pools table. If invalid values are set, an error message
appears. If Detail is clicked when you select a row, the Pool Property window appears
The Pool Type, Multi-Tier Pool,Pool Volume Selection, and Pool Name must be set. If the
required items are not registered, you cannot click Add.
If you select a row and click Detail, the Pool Properties window appears. If you select a row
and click Remove, the message appears asking whether you want to remove the selected row
or rows. If you want to remove the row, click OK.
20. Click Next.
The Create LDEVs window appears. Go to “Creating V-VOLs” (page 133) to create LDEVs.
If Subscription Limit of the created pool is set to 0%, the Create LDEVs window does not appear.
Click Finish and the Confirm window appears.
21. In the Confirm window, click Apply to register the setting in the task.
If you select a row and click Detail, the Pool Properties window appears.
If the Go to tasks window for status check box is selected, the Tasks window appears.
Working with THP V-VOLs
About THP V-VOLs
Thin Provisioning requires the use of THP V-VOLs, which are virtual volumes with no physical
memory space. In Thin Provisioning, multiple THP V-VOLs can be created.
A THP V-VOL is a volume in a thin provisioning storage system. It is the virtual volume from a THP
pool. Data in the THP pool is used via a THP V-VOL. A THP V-VOL is a virtual LU to some hosts.
On open systems, OPEN-V is the only supported emulation type on a THP V-VOL. You can define
multiple THP V-VOLs and assign them to a Thin Provisioning pool.
Relationship between a pool and THP V-VOLs
Before you can use Thin Provisioning, a THP V-VOL and a pool are required. Thin Provisioning
uses the pool volumes in a pool through the THP V-VOLs.
The following figure shows the relationship between a pool and THP V-VOLs.
132 Configuring thin provisioning