Disabling the capacity saving functions on DP-VOLs

When you disable the capacity saving setting, both the used capacity of the pool and the physical used capacity of the pool increase due to the process of expanding the data (rehydration). Do not disable the capacity saving function on DP-VOLs when pool capacity is depleted.

Use the following formulas to calculate what the used capacity and physical used capacity of the pool will be after the expanding process completes: 

pool-used-capacity-size-after-expanding = 
   used-pool-capacity-size + (used-DP-VOL-capacity × saving-ratio-of-the-pool-[%])

physical-pool-used-capacity-size-after-expanding = 
   used-physical-pool-capacity-size* + (used-DP-VOL-capacity × saving-ratio-of-the-pool-[%])

* If accelerated compression is used, you must confirm the physical used capacity of the pool.

Device Manager - Storage Navigator displays this information as follows:

  • used-pool-capacity-size: Displayed as Capacity - Used on the Pools window.
  • used-physical-pool-capacity-size: Displayed as Physical Capacity - Used on the Pools window.
  • saving-ratio-of-the-pool-[%]: Displayed as Pool Saving (Post Process Data) - Saving (%) on the Pools window.
  • used-DP-VOL-capacity: Displayed as Capacity - Used on the Virtual Volumes tab of each pool window.

Caution
  • The expanding process is suspended when the size of the used capacity or physical used capacity of a pool reaches the depletion threshold. If this occurs, you must resolve the causes of the SIM message. When enough pool capacity is ensured, the expanding process will start again.
  • If the SVP or a Device Manager - Storage Navigator secondary window is in Modify mode while the rehydration processing of the capacity-saving-enabled DP-VOLs is in progress, a conflict occurs and the rehydration processing does not complete (Capacity Saving Status remains Rehydrating). In this case, change the SVP or secondary window to View mode.
NoteDisabling the capacity saving setting for DP-VOLs with deduplication and compression enabled might take a while to complete. After the processing to disable the setting has started, it cannot be stopped. I/Os can be received during rehydration (Rehydrating status).

Before you begin

  • The Storage Administrator (Provisioning) role is required to perform this task.
  • The status of the pool must be other than Blocked by pool failure.
  • The Capacity Saving status must be other than Deleting Volume or Failed.

Procedure

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

  2. Click Logical Devices.

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

  4. In the Edit LDEVs window, click Capacity Saving, and select Disabled.

    Note If the LDEV status of the deduplication system data volume in the pool is other than Normal, you cannot change the setting from Deduplication and Compression to Disabled.

  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 Go to tasks window for status is selected, the Tasks window opens automatically.
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