Symantec NetBackup Manual page 31

AdvancedDisk disk pool properties (continued)
Table 4-4
Property
High water mark
Low water mark
Description
The High water mark setting is a threshold that triggers the
following actions:
When an individual volume in the disk pool reaches the High
water mark, NetBackup considers the volume full.NetBackup
chooses a different volume in the disk pool to write backup
images to.
When all volumes in the disk pool reach the High water mark,
the disk pool is considered full. NetBackup fails any backup
jobs that are assigned to a storage unit in which the disk pool
is full. NetBackup also does not assign new jobs to a storage
unit in which the disk pool is full.
NetBackup begins image cleanup when a volume reaches the
High water mark; image cleanup expires the images that are
no longer valid. For a disk pool that is full, NetBackup again
assigns jobs to the storage unit when image cleanup reduces
any disk volume's capacity to less than the High water mark.
If the storage unit for the disk pool is in a capacity-managed
storage lifecycle policy, other factors affect image cleanup.
See the NetBackup Administrator's Guide for UNIX and Linux,
Volume I.
See the NetBackup Administrator's Guide for Windows, Volume
I.
The default is 98%.
The Low water mark is a threshold at which NetBackup stops
image cleanup.
TheLow water mark setting cannot be greater than or equal to
the High water mark setting.
The default is 80%.
Configuring AdvancedDisk
Configuring an AdvancedDisk disk pool
31