Exclusive use of disk volumes with AdvancedDisk
After a file system is imported as a disk volume into a NetBackup disk pool, NetBackup assumes that no third-party applications use this file system. However, NetBackup has no mechanism in place to enforce this assumption. Failure to ensure sole use or ownership of a disk volume by NetBackup may cause incorrect behavior of the capacity management components in NetBackup, resulting in premature image expiration.
For example, in a disk pool containing one disk volume with a high water mark set to 90% and a low water mark set to 70%, if 50% of the available space used by applications other than NetBackup only 40% will be available to NetBackup. When the high water mark is reached, 50% of all the backups held on the disk volume will be removed, rather than 20% if the disk volume is exclusively available to NetBackup.
Recommendation: You should not use disks that are used as AdvancedDisk volumes in NetBackup for any other purpose, including MSDP deduplication volumes.