DSSU sizing is really important.  If the Disk runs out then you start
getting status 84's and jobs fail.  This seems reasonable except that
NBU does not free up the space for the failed jobs until the jobs are
restarted. If the job is a large one then you could get several more
backup failures from other jobs before the job retries and cleans up the
old space from the failed backup.  

The cleanup process for disk images already copied to tape is not very
efficient.  I also have had to create a script that checks for disk
backup images that are successfully copied to tape so that I can clean
up the images to make room for the new backups coming in.  The script
also checks for high and low watermarks and emails/pages if the disk
space gets lower than 90%

I also agree that you want to use fast disk for this.  We have tested
with a few different levels and are now using SAN attached RAID10

I am at NBU 5.1MP4.  I am looking at moving to NBU 6.0 MP2 to take
advantage of all the new DSSU improvements and features.

Monte 

-----Original Message-----
From: veritas-bu-admin AT mailman.eng.auburn DOT edu
[mailto:veritas-bu-admin AT mailman.eng.auburn DOT edu] On Behalf Of Johnny
Oestergaard
Sent: Thursday, April 27, 2006 10:44 AM
To: 'Steven L. Sesar'; 'NetBackup Veritas'
Subject: RE: [Veritas-bu] DSSU/DSU experience

I have been using DSSU since 5.1 came out.
But I have primarily used it for very slow clients so that I didn't
block my
tapedrives with these backups.

It has been working really fine, except the lack of configuration and
performance/tuning. And it has been really easy to use.

I have upgraded to 6.0 MP2 now, and there are a lot of nice new stuff in
6.0
regarding DSSU, but I haven't had that much time to check it out. But it
seems to perform better and there are also more configuration options.
Not
that I couldn't make a 1 meter list of things I would like to have.

DSU's I have only used for testing, so no comments from me on that. But
when
I looked at it DSSU seemed to me to be a much better solution. At least
in
our installation.

Have never used VTL, so also no comments on that.

/johnny

-----Original Message-----
From: veritas-bu-admin AT mailman.eng.auburn DOT edu
[mailto:veritas-bu-admin AT mailman.eng.auburn DOT edu] On Behalf Of Steven L.
Sesar
Sent: 27. april 2006 19:09
To: NetBackup Veritas
Subject: [Veritas-bu] DSSU/DSU experience

We're in the process of rearchitecting our BUR infrastructure. The most 
profound change will be the addition of disk storage, as we are 100% 
tape, right now. We're considering a few different disk technologies, 
such as VTL, DataDomain NAS heads, as well as traditional DSU/DSSUs.

I've heard anecdotal evidence that DSU/DSSU functionality in NBU 5.1 is 
less-than-stellar. Would anyone care to share their overall experience 
with  disk storage?

Thanks,

Steve

 

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