96 Configuring and Managing RAIDManaging Preserved CacheIf a virtual disk becomes offline or is deleted because of missing physicaldisks, the controller preserves the dirty cache from the virtual disk.The preserved dirty cache, known as pinned cache, is preserved until youimport the virtual disk or discard the cache.NOTE: Certain operations, such as creating a new virtual disk, cannot beperformed if preserved cache exists. You have to enter the BIOS ConfigurationUtility to resolve the situation before you boot to the operating system. Messagesare displayed notifying you that you must enter the BIOS Configuration Utility todiscard the preserved cache or import the virtual disks with the preserved cache.CAUTION: If there are any foreign configurations, it is strongly advised that youimport the foreign configuration before you discard the preserved cache.Otherwise, you might lose data that belongs with the foreign configuration.Perform the following steps to select whether to import the virtual disk ordiscard the preserved cache:1 On the VD Mgmt screen, click on a controller icon.2 Press to display the menu of available actions.3 Select Manage Preserved Cache.A message is displayed advising you to import the foreign configurationbefore you discard the preserved cache to avoid losing data belonging tothe foreign configuration. Confirm whether you want to continue. TheManage Preserved Cache screen displays the affected virtual disks.4 You can choose to discard the cache on the Manage Preserved Cachescreen. If you press Cancel, the process is cancelled and the PreservedCache Retained dialog box is displayed.If you choose to discard the cache, you are prompted to confirm yourchoice. If you choose to retain the cache, a message is displayed to notifyyou that you cannot perform certain operations while the cache exists.Click OK to continue.
