Decreasing pool capacity

You can decrease the pool capacity for up to eight tasks at the same time.

For more information about decreasing pool capacity, formatting LDEVs, and the Shrink Pool window, see the Provisioning Guide for your storage system.

If processing ends abnormally, check the Tasks window.

Before you begin

• The used capacity of the pool-VOL must be below the pool threshold.

• If you are deleting pool-VOLs with system area, there must be more than 4.2 GB of available capacity.

• You must not be currently performing any of the following tasks:

• Creating a pool.

• Deleting a pool.

• Increasing a pool.

• Deleting a pool-VOL to decrease the pool capacity.

• Recovering a pool.

• Stopping the process of decreasing pool capacity.

• Editing a data pool warning threshold.

• Simultaneously running CCI commands to decrease the pool capacity.

• You must not be maintaining the cache memory.

• The cache memory must be up and running.

• The I/O load to the V-VOL related to the pool must be low.

Procedure

1. Navigate to the Pools window.

In Command Suite:

1. On the Resources tab, click Storage Systems, and then expand the storage system tree.

2. Expand the target storage system, right-click DP Pools, and then select System GUI.

In Device Manager - Storage Navigator:

1. In the Explorer pane, click Storage Systems, expand the storage system tree, and then click Pools.

2. In the Pools tab, click the name of the pool for which you want to decrease capacity.

3. In the Pool Name window, in the Pool Volumes tab, from the list of volumes, select the check box for the pool that contains the pool-VOLs you want to delete to decrease pool capacity, and then click Shrink Pool.

 You can select one or more pool volumes.

4. In the Prediction Result of Shrinking table, confirm the pool capacity, the used pool capacity, and the free pool capacity, before and after shrinking.

5. Accept the default task name or enter a unique name.

You can enter up to 32 letters, numbers, and symbols, except the following:

\ / : , ; * ? " < > |

6. If you want to monitor the task after submitting it, select Go to tasks window for status.

7. Click Apply to submit the task.

Result

The tiers in pools are deleted and the pool capacity is decreased.