Changing a pool for Smart Tiers to a pool for Thin Provisioning
The Storage Administrator (Provisioning) role is required to perform this task.
You can change a Smart Tiers pool to a Thin Provisioning pool. However, you cannot change the
pool status of Smart Tiers to disable in the following cases:
• Tier relocation is being executed manually.
• Pool-VOLs are being deleted.
• Zero pages are being reclaimed.
1. In the Storage Systems tree on the left pane of the top window, select Pool.
The pool name appears below Pool.
2. Select a pool that is changed from a pool for Smart Tiers to a pool for Thin Provisioning.
The pool information appears.
3. Click More Actions to select Edit Pool.
The Edit Pool window appears.
4. Check Smart Pool and select Disable from the Smart Pool option.
Click OK in the warning message.
5. Click Finish.
The Confirm window appears.
6. In the Task Name text box, enter the task name.
You can enter up to 32 ASCII characters and symbols in all, except for \ / : , ; * ? " < > |.
The value "date-window name" is entered by default.
7. In the Confirm window, click Apply to register the setting in the task.
If the Go to tasks window for status checkbox is selected, the Tasks window appears.
Working with pools
About pools
Thin Provisioning requires the use of pools. A pool consists of more than one pool-VOL. Pages in
the pool are assigned to store user data and control information. Four pages on a THP V-VOL are
required for the control information.
A storage system supports up to 128 pools, each of which can contain up to 1024 pool-VOLs and
63,232 THP V-VOLs per pool. The pool for Thin Provisioning cannot be used in conjunction with
other pools.
The 128-pool maximum per storage system applies to the total number of Thin Provisioning pools
and Smart Tiers pools. The pool for Thin Provisioning or Smart Tiers cannot be used in conjunction
with other pools.
A pool number must be assigned to a pool. Multiple THP V-VOLs can be related to one pool.
The total pool capacity combines the capacity of all the registered Thin Provisioning pool-VOLs
assigned to the pool. Pool capacity is calculated using the following formulas:
• capacity of the pool (MB) = total number of pages * 42 - 4200
4200 in the formula is the management area size of the pool-VOL with System Area.
• total number of pages = Σ(floor(floor(pool-VOL number of blocks ÷ 512) ÷
168)) for each pool-VOL
Changing a pool for Smart Tiers to a pool for Thin Provisioning 121
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