22. 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.
23. 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 checkbox 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.
Protecting THP V-VOLs
By using of the protecting function of THP V-VOL, when problems occur in the pool or pool-VOLs,
THP V-VOLs using the pool can be protected from read and write requests, and change the access
attribute of the THP V-VOL to the Protect attribute. The function to protect from reading and writing
of THP V-VOL when the pool usage reaches the full size is displayed in the window as Protect
V-VOLs when I/O fails to Blocked Pool VOL. The function to protect from reading and writing of
THP V-VOL when the pool-VOL is blocked is displayed in the window as Protect V-VOLs when I/O
fails to Blocked Pool VOL. For details about setting items, see “Create Pools window” (page 314).
132 Configuring thin provisioning
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