Users Guide

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The status of the controller is affected by the preserved cache. The controller status is displayed as degraded if the controller has preserved cache.
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Manage Preserved Cache
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You can discard the preserved cache only if all of the following conditions are met:
l The controller does not have any foreign configuration. Select Click for Preview to view details of the foreign configuration. See "Foreign Configuration
Operations."
l The controller does not have any offline or missing virtual disks. If there are offline or missing virtual disks, ensure you have a backup of these virtual
disks.
l Cables to any virtual disk are not disconnected.
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CAUTION: You may not be able to use Storage Management to manage the preserved cache in some cases. As an example, consider you have a
RAID 1 level with two disks—D1 and D2. If you now remove D2, the virtual disk is degraded and the data in the controller cache is written to D1.
At this point, D1 has the latest data. Now, if you re-insert D2 and pull out D1, the virtual disk will still be degraded and will not have the latest
data.