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Re: [Veritas-bu] Measuring redundant backup data
2008-04-08 23:22:09
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It should be possible to go through the catalog and
determine how much redundancy is present based on the schedules and retentions.
For example if the schedule calls for monthly fulls and the same file appears in
12 consecutive full backups (without appearing in any intervening incremental)
then that's 10 unnecessary copies, assuming 2 are needed for adequate
protection. I know there's additional duplication if the same file exists
on two clients but that's harder to measure without comparing the data.
I'm just interested in measuring the unnecessary copies that were created as a
result of multiple backups of the same data.
On Tue, Apr 8, 2008 at 5:57 PM, Jeff Lightner < jlightner AT water DOT com> wrote:
I
don't know a way to measure how much is "redundant" easily. Maybe
the
much vaunted Aptare would have that - I'll wait for their fan club
to
comment on that. :-)
Not a chance - Aptare just gets job status and doesn't ever see the backup
data.
So
far it appears to us the deduplication devices are living up to
or
exceeding expectations.
That's purely site specific. With PureDisk backing up our remote
sites, I think we're under 5:1 but we're still building up the generation
count. When we pointed some of larger main campus data at it, it wasn't
even that high - nowhere near high enough to justify the cost.
Some vendors will let you eval you a unit - that's the only way to know
how well you're going to dedupe because it is so client specific. If you
have a ton of application servers with mostly OS and little application, you're
going to de-dupe extremely well. If you have 1 file server full of TIFF
data that never stays around very long, you won't de-dupe well at all. -- Ed Wilts, Mounds View, MN, USA mailto: ewilts AT ewilts DOT org _______________________________________________
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