Deleting a tier in a pool

You must delete all the pool-VOLs in the tier to be deleted. When pool-VOLs in the tier are empty, the appropriate tier is deleted.

If you delete a pool, its pool-VOLs (LDEVs) will be blocked. If they are blocked, format them before using them.

You cannot delete the pool-VOL when:

  • Creating the pool.
  • Deleting the pool.
  • Increasing the pool capacity.
  • Decreasing the pool capacity.
  • Restoring the pool.
  • Stopping decreasing the pool capacity.
  • Changing the threshold.
  • Initializing the pool capacity.
  • Changing the external LDEV tier rank.

Notes on deleting a tier in a pool

You cannot delete a pool-VOL under these conditions.

  • The used capacity of the pool-VOL would exceed the pool threshold if the pool-VOL were deleted.
  • The subscription rate of the total V-VOL capacity including the control information would exceed the subscription limit if the pool-VOL were deleted. For details about the formula used to calculate the required pages for one DP-VOL including the control information, see Pool subscription limit.
  • The pool-VOL with system area has less than 4.2 GB of free space. There must be 4.2 GB of free space in the pool in order to delete the pool-VOL with system area.

Deleting the pool-VOL stops the tier relocation. The process resumes after the pool-VOL is deleted.

Before you begin

The Storage Administrator (Provisioning) role is required to perform this task.

Procedure

  1. Click Storage Systems, and then expand the Storage Systems tree.

  2. Click Pools.

  3. Select the pool that contains the pool-VOLs to be deleted.

  4. Select the Pool volumes tab and select all the pool-VOLs contained in the tier to be deleted.

    You cannot delete a pool-VOL unless Shrinkable has been applied.

  5. Click Shrink Pool.

  6. In the Shrink Pool window, verify the changes.

    The details of Before Shrinking and After Shrinking, including the pool capacity, the used pool capacity and the free pool capacity, appears in Prediction of Shrinking.

  7. Click Finish.

    The Confirm window appears.

  8. In the Task Name text box, type a unique name for the task or accept the default.

    You can enter up to 32 ASCII characters and symbols, with the exception of: \ / : , ; * ? " < > |. The value "date-window name" is entered by default.

  9. Click Apply.

    If the Go to tasks window for status check box is selected, the Tasks window appears.
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