Veritas-bu

Re: [Veritas-bu] DSSU image expiration in 6.5.6

2010-10-29 11:49:23
Subject: Re: [Veritas-bu] DSSU image expiration in 6.5.6
From: "Martin, Jonathan" <JMARTI05 AT intersil DOT com>
To: <VERITAS-BU AT MAILMAN.ENG.AUBURN DOT EDU>
Date: Fri, 29 Oct 2010 11:49:01 -0400
Are you assuming that NetBackup uses the high water marks for the entire
storage group? How is this group configured (round Robin, Least used
etc...) If you have a 2TB DSSU that is 95% full, and a 920GB job is
assigned to that DSSU (instead of another DSSU) then NetBackup is going
to clear enough space to write the 920GB backup. If that 95% is a single
image, then the entire image is going to be overwritten. If that image
spans multiple DSSUs, then when it expires to clear the space, it will
expire the image from all DSSUs on which is resides. Generally I put my
"big boy" backups on their own dedicated DSSUs, and use groups for all
the "small" (<100GB) jobs into Storage Groups. Alternately, you can
break up your big jobs into smaller "chunks" with multiple streams, job,
etc... I think your problem is the Storage Unit Group. It's very
difficult to predict exactly what gets cleared when, unless you can
specifically control which job goes where.

-Jonathan
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