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Re: [Veritas-bu] Multiplexing on VTLs
2008-05-01 15:09:47
Mike is right, depending on the vendor. Please
note that he works for one of them, so he should know what he’s talking
about.
Dedupe works at the subfile-level, but not
at the block level. (Vendors that “chunk” data up, which isn’t
all of them, often create chunks that are larger than a block.) Therefore,
multiplexing absolutely CAN remove all deduplication capability, depending on
the vendor you’re using and how the stars line up. With some vendors, it
will make your dedupe ratio 1:1. With others, it will not affect it at all.
From:
veritas-bu-bounces AT mailman.eng.auburn DOT edu
[mailto:veritas-bu-bounces AT mailman.eng.auburn DOT edu] On Behalf Of Ed Wilts
Sent: Wednesday, April 30, 2008
4:12 PM
To: Mike Sparkes
Cc: veritas-bu AT mailman.eng.auburn DOT edu
Subject: Re: [Veritas-bu]
Multiplexing on VTLs
On Wed, Apr 30, 2008 at 5:58 PM, Mike Sparkes <Mike.Sparkes AT quantum DOT com> wrote:
if you ever move
to de-duplication, the act of multiplexing your backups ruins the
ability to detect duplicate blocks. Your de-dupe ratio will be terrible.
I don't follow your logic here. Why would multiplexing affect the de-dupe
ratio?
.../Ed
--
Ed Wilts, Mounds View, MN, USA
RHCE, BCFP, BCSD, SCSP
mailto:ewilts AT ewilts DOT org
If I've helped you, please make a donation to my favorite charity at http://firstgiving.com/edwilts
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