Veritas-bu

[Veritas-bu] cumulative incremental - best to use: when?

2006-08-17 07:59:00
Subject: [Veritas-bu] cumulative incremental - best to use: when?
From: stumpb at michigan.gov (Bob Stump)
Date: Thu, 17 Aug 2006 07:59:00 -0400
Some NetBackup admins that use diffInc will throw in a CumInc in the
middle of the week.

>>> "Ed Wilts" <ewilts at ewilts.org> 8/17/2006 7:43 AM >>>
James C Siano wrote:
> Would cum.incr. be more advantageous for certain situations.
> 
> Or where
> else would it be best used overall from those on the list using that
> formula? 

CumInc is used when you want to minimize the tape mounts for a restore
and
also to minimize the risk of data loss in case of a bad tape.  Say your
full
was Sunday and it's now Thursday and you need to do a restore.  With
DiffInc, you're mounting Sunday's tape, then the Monday, Tuesday, and
Wednesday tapes.  If Monday was bad, you're dead in the water.  With a
CumInc policy, you'd restore from your Sunday and Wednesday tapes and
be
done. 

   .../Ed

Ed Wilts
mailto:ewilts at ewilts.org
Mounds View, MN 55112


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