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Re: [Veritas-bu] Dedupe ratios and checkpoint backups
2011-09-06 14:56:06
If at all, this would probably affect fixed-block
solutions more than the variable-block ones. The variable-blocked
solutions would continue to look for identical blocks, but in different
positions of the data stream.
| From:
| "Stafford, Geoff" <GStafford AT barclaycardus DOT com>
|
| To:
| "veritas-bu AT mailman.eng.auburn DOT edu"
<veritas-bu AT mailman.eng.auburn DOT edu>
|
| Date:
| 09/06/2011 02:45 PM
|
| Subject:
| [Veritas-bu] Dedupe ratios and checkpoint
backups
|
| Sent by:
| veritas-bu-bounces AT mailman.eng.auburn DOT edu |
Just wondering if anyone has done testing
or seen documentation (from any dedupe vendor) regarding the usage of enabling
checkpoints on backups that are being deduplicated? I would think
that the introduction of checkpoints every X minutes into the datastream
would interrupt the continuity of the data and make it seem more unique
thus negatively affecting dedupe ratios but I’m wondering by how much.
Most, if not all, of the variable length guys have the ability to
‘re-align’ themselves to the start of the files so I would think it might
be more pronounced on large files vs your average server but I’m just
thinking out loud.
Anyone seen a recommendation or actually
tested themselves?
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Barclays
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