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 and formatting LDEVs, see the Hitachi Virtual Storage Platform G200, G400, G600 Provisioning Guide.

Prerequisites for decreasing pool capacity

The following are the prerequisites for decreasing pool capacity and formatting the available pool capacity:

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

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

• You are currently not:

• 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 are not maintaining the cache memory.

• The cache memory is up and running.

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

If processing ends abnormally, check the Tasks window.

1. Navigate to the Pools window.

In Hitachi 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, and then expand the storage system tree.

2. Click Pools.

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

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

 You can select one or more pools.

4. In the Confirm window, complete the following.

• In the Prediction Result of Shrinking table, confirm the pool capacity, the used pool capacity, and the free pool capacity.

- Before Shrinking

- After Shrinking

• Enter a name for your task in Task Name.

• (Optional) Select Go to tasks window for status if you want the Tasks window to open after you click Apply.

5. Click Apply.

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

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

Related topics

• For more information about the Shrink Pool window, see the Hitachi Virtual Storage Platform G200, G400, G600 Provisioning Guide.

• Stopping the process of decreasing pool capacity.

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