LSI Corporation
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12Gb/s MegaRAID SAS Software User Guide
March 2014
Chapter 4: Ctrl-R Utility
Discarding Preserved Cache
NOTE Start a consistency check immediately after the rebuild is complete, to
ensure data integrity for the virtual drives.
Scenario 3: If all the drives in a virtual drive are removed, but at different times, and reinserted, the controller
considers the drives to have foreign configurations.
Import or clear the foreign configuration. If you select Import, all drives that were pulled before the virtual drive
became offline will be imported and will be automatically rebuilt. Automatic rebuilds will occur in redundant
virtual drives.
Scenario 4: If the drives in a nonredundant virtual drive are removed, the controller considers the drives to have
foreign configurations.
Import or clear the foreign configuration. No rebuilds will occur after the import operation because there is no
redundant data to rebuild the drives.
4.10 Discarding Preserved Cache
If the controller loses access to one or more virtual drives, the controller preserves the data from the virtual drive. This
preserved cache, is preserved until you import the virtual drive or discard the cache.
Certain operations, such as creating a new virtual drive, cannot be performed if preserved cache exists.
CAUTION If there are any foreign configurations, import the foreign
configuration before you discard the preserved cache. Otherwise, you
might lose data that belongs to the foreign configuration.
Perform the following steps to discard the preserved cache:
1. In the VD Mgmt screen, navigate to the controller, and press the F2 key.
2. Navigate to Manage Preserved Cache, and press Enter.
The Manage Preserved Cache dialog appears.
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