Increasing pool capacity

Adding pool-VOLs to a pool increases, or expands, the pool’s capacity. Check the pool’s available capacity and expand the pool as needed.

Use the following formula to calculate the pool capacity: 

Pool capacity = Total capacity of pool-VOLs in the pool - Management area size of the pool-VOL with the system area

You can add up to 1,024 pool-VOLs (including volumes already in a pool) to a pool.

Adding pool-VOLs to pools to expand pool capacity moves data to the added space on a per-page basis, which rebalances the usage rate among parity groups of the pool-VOLs.

CautionMoving existing data to the added space on a per-page basis can decrease host I/O performance.
NoteYou can only increase the capacity for one pool at a time.

Before you begin

You must not be currently decreasing the pool capacity.

Procedure

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

  2. In the Pools tab, select the check box for the pool to which you want to add a pool-VOL from the list, and then click Expand Pool.

  3. In the Expand Pool window of the Expand Pool wizard, click Select Pool VOLs.

  4. In the Select Pool VOLs window, complete the following, and then click OK:

    1. (Optional) To filter rows, in the Available Pool Volumes table, select ON in the Filter component.

    2. (Optional) To select all of the pool-VOLs in the list, in the Available Pool Volumes table, click Select All Pages.

    3. (Optional) To specify the capacity unit and the number of rows to display, in the Available Pool Volumes table, click Options.

    4. In the Available Pool Volumes table, select the LDEV you want, and then click Add.

      The LDEV is moved to the Selected Pool Volumes table.
    NoteIf you are adding an LDEV belonging to a parity group for which accelerated compression is enabled, see the related section in Provisioning Guide for your storage system.

  5. In the Expand Pool window of the Expand Pool wizard, click Finish, and then confirm the settings.

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

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

    \ / : , ; * ? " < > |

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

  8. Click Apply to submit the task.

Parent Topic
  • Managing pools

    Use Thin Image to manage pools, such as monitoring information about a selected pool (for example, the LDEV ID and Used Pool Capacity), viewing used pool capacity by pool or by the Thin Image pair's root volume, viewing the progress of rebalancing the pool usage rates among parity groups, increasing pool volume by adding pool-VOLs to a pool, decreasing the pool volume, and monitoring the pool usage rate.

Child Topics