HP MSA 1040 HP MSA 1040 CLI Reference Guide (762782-001, March 2014) - Page 36

clear cache Description Clears unwritable cache data from both controllers. This data cannot be written to disk because it is associated with a volume that no longer exists or whose disks are not online. If the data is needed, the volume's disks must be brought online. If the data is not needed it can be cleared, in which case it will be lost and data will differ between the host and disk. Unwritable cache is also called orphan data. NOTE: Only use this command when all vdisks are online. Improper use of this command may result in data loss. You can clear unwritable cache data for a specified volume or for all volumes. If unwritable data exists for more than one volume and you specify the volume parameter, the command will clear unwritable data for that volume only. If unwritable data exists for more than one volume and you omit the volume parameter, the command will clear unwritable data for the first volume only and you must re-run the command for each remaining volume. Use the following process to ensure all cache data has been cleared. 1. Run the show unwritable-cache command to view the percent of unwritable cache in each controller. 2. Run the clear cache command. 3. Run the show unwritable-cache command to view the percent of unwritable cache in each controller. If the value is not 0, repeat steps 1-3 until the value is 0. Syntax clear cache [volume volume] Parameters volume volume Optional. The name or serial number of a specific volume for which to clear unwritable cache data. For volume syntax, see "Command syntax" (page 20). Example Clear unwritable cache data for volume V1 from both controllers: # clear cache volume v1 Success: Command completed successfully - If unwritable cache data existed, it has been cleared. (2012-01-18 14:21:11) See also • show unwritable-cache • show volumes 36 Alphabetical list of commands