About the cache partition
The snapctl driver and VxFS snap driver are copy-on-write snapshot methods that require a cache partition. For FlashBackup clients before NetBackup 5.0, the cache partition was specified in the policy's Files tab as a CACHE = raw_partition entry. (The Files tab is now called the Backup Selections tab.)
Note:
CACHE entries are allowed only when the policy's option is deselected. If is selected, NetBackup attempts to back up the CACHE entry and the backup fails.
All entries must specify the raw device, such /dev/rdsk/c0t0d0s1. Do not use the actual file name; you must use the link form of cxtxdxsx.