Questions on OST Diskpool High and Low watermark properties

[sugarboy]

Hi,

As per description of High watermark @

http://www.symantec.com/business/support/index?page=content&id=HOWTO45040

1.     When an individual volume in the disk pool reaches the High water mark, NetBackup considers the volume full. NetBackupchooses a different volume in the disk pool to write backup images to.

Question: Will it choose different volume (i.e LSU) under Diskpool without spanning enabled?

2.   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.

 3. NetBackup begins image cleanup when a volume reaches the High water mark; image cleanup expires the images that are no longer valid.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.

Question: Here what does the statemtn "Images that are no longer valid", How does NBU determines Invalid images and how to make a Images Invalid?

Hope you are clear with questions and expecting responses for the same.

Thanks in advance,

Sagar

[Yasuhisa_Ishika]

For OST storage unit, backup image spans between disk volumes although "Allow backups to span disk" is unchecked. NetBackup 7.1 Administrator's Guide Volume I for UNIX/Linux, page 161 --- The Allow backups to span disk property does not apply to AdvancedDisk or OpenStorage storage units. Backups span disk volumes within disk pools automatically. --- Backup images within retention are treated as "valid". Whereas, once expiration date of backup images is past, these backup images are treated as "invalid", and Image Cleanup process erases backup entities reside on disk volumes.