> The high watermark serves two purposes - (1) It prevents
> any new backup jobs from being sent to the STU, and (2)
> It triggers image expirations on the STU. The function
> #1 is not applicable to Disk Staging STU; however, the
> functionality #2 should work for it. So, if you lower
> HWM for the Disk Staging STU, it would trigger image
> expirations earlier so that when the backup jobs are
> sent to the> STU, NetBackup does not have to expire
> images then (potentially saving time for the backup).
> 
> Hope this helps. I agree, the documentation is little
> unclear on this.

That's an understatement!

6.5 DSSU behavior is re-described in technote 316679.  

HWM, LWM and DS[S]U behavior have never, to my knowledge, been
correctly described in one place, and the incorrect descriptions
have been most unhelpful.  Let's hope this technote is a step in the
right direction.

As long as this has morphed to DSSUs, I had to look up how to
display actual available space on my 6.5 Basic Disk DSSU setup now
that the .ds files are gone.  In case it helps anyone else, it's
something like

  ~/admincmd/nbdevquery -listdv -stype BasicDisk -dp DSSU-a -D

See the 6.5 NetBackup Administrator's Guide, Volume 1, p 242 or so.


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