Dell PowerEdge RAID Controller 9 User’s Guide H330, H730, and H830

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Managing preserved cache

If a virtual disk goes offline or is deleted goes of missing physical disks, the controller preserves the dirty cache from the virtual disk. The preserved dirty cache, known as pinned cache, is preserved until you import the virtual disk or discard the cache.

NOTE:Certain operations, such as creating a new virtual disk, cannot be performed if preserved cache exists. You have to enter the BIOS Configuration Utility (<Ctrl> <R>) to resolve the situation before you boot to the operating system. Messages are displayed notifying you that you must enter the BIOS Configuration Utility (<Ctrl> <R>) to discard the preserved cache or import the virtual disks with the preserved cache.
CAUTION:If there are any foreign configurations, it is strongly advised that you import the foreign configuration before you discard the preserved cache. Otherwise, you might lose data that belongs with the foreign configuration.
To manage the preserved cache:
  1. On the VD Mgmt screen, click on a controller icon.
  2. Press <F2> to display the available actions.
  3. Select Manage Preserved Cache.
    A message is displayed advising you to import the foreign configuration before you discard the preserved cache to avoid losing data belonging to the foreign configuration. Confirm whether you want to continue. The Manage Preserved Cache screen displays the affected virtual disks.
  4. You can choose to discard the cache on the Manage Preserved Cache screen. If you press Cancel, the process is cancelled and the Preserved Cache Retained dialog box is displayed.
    If you choose to discard the cache, you are prompted to confirm your choice. If you choose to retain the cache, a message is displayed to notify you that you cannot perform certain operations while the cache exists. Click OK to continue.

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