Enabling capacity saving on DP-VOLs

Use this procedure to enable the capacity saving function (compression, or deduplication and compression) on an existing DP-VOL. If the DP-VOL is in a Dynamic Tiering pool with active flash enabled, you cannot enable the capacity saving function.

Requirements for enabling deduplication on a DP-VOL:

  • The dedupe and compression license must be installed.
  • The deduplication function must be enabled on the pool.
  • The pool must not be blocked.
  • A sufficient number of cache management devices must be available.
  • The LDEV status of the DP-VOL must be Normal.
  • The emulation type of the DP-VOL must be OPEN-V.
  • The capacity saving status of the pool must not be Deleting Volume, Failed, or Rehydrating.
  • Data Direct Mapping must be disabled.
  • Full Allocation must be disabled.
  • The DP-VOL must not be used as a Universal Replicator journal volume.

CautionDo not use capacity saving and NAS deduplication on the same volumes, because the additional processing decreases the I/O performance substantially. For information about the NAS deduplication function, see the File Services Administration Guide.

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 Logical Devices.

  3. In the LDEVs pane, select an LDEV ID, and click Edit LDEVs.

  4. In the Edit LDEVs window, click Capacity Saving, and then select either Compression or Deduplication and Compression.

    CautionIf you enable Deduplication and Compression on a DP-VOL, you will not be able to change the setting from Deduplication and Compression to Compression later.
    Note
    • If Deduplication is Not Available in the pool, Deduplication and Compression cannot be selected.
    • If the LDEV status of a deduplication system data volume in the pool is other than Normal, Deduplication and Compression cannot be selected.

  5. Click Finish. The Confirm window appears.

  6. 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.

  7. Click Apply.

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