Darren.Sykes at csr
Nov 13, 2008, 2:34 PM
Post #4 of 4
(1101 views)
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RE: de-dup of memory? (was Re: Snapvault slow on one specific volume?)
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No, not true (yet).
I was misinformed, though I do believe it's a planned feature. At the moment the filer's not bright enough to store the block once in cache.
________________________________
From: Page, Jeremy [mailto:jeremy.page [at] gilbarco]
Sent: Thu 11/13/2008 17:05
To: Todd C. Merrill; Darren Sykes
Cc: Glenn Walker; toasters [at] mathworks
Subject: RE: de-dup of memory? (was Re: Snapvault slow on one specific volume?)
I don't know :)
In theory it should work. When you request data you're not requesting it from the disk, your asking for a specific block. If that block is in cache it should not matter if it's deduped (and pretending to be several blocks) or not.
-----Original Message-----
From: Todd C. Merrill [mailto:tmerrill [at] mathworks]
Sent: Thursday, November 13, 2008 12:04 PM
To: Darren Sykes
Cc: Glenn Walker; Page, Jeremy; toasters [at] mathworks
Subject: de-dup of memory? (was Re: Snapvault slow on one specific volume?)
On Wed, 15 Oct 2008, Darren Sykes wrote:
> Iąd say it was probably the bug; in theory dedup should increase performance
> in that situation as the block would be stored in the cache and therefore we
> wouldnąt need to go to disk to get that data.
Is this true?
Is memory "de-dup'ed" as well? That is, when you access a file through
the cache, if it ends up at a de-dup'ed block, is it really the same
block in *memory*, too? Or, is the path through memory/cache unique
and only the final disk store de-dup'ed?
Until next time...
The MathWorks, Inc. 508-647-7000 x7792
3 Apple Hill Drive, Natick, MA 01760-2098 508-647-7001 FAX
tmerrill [at] mathworks http://www.mathworks.com <http://www.mathworks.com/>
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