Have you got any pointers
regarding this? This is one not quite clear point to me too – whether
deduplication affects sequential IO and what “real life” impact is.
С
уважением / With best
regards / Mit freundlichen Grüβen
---
Andrey Borzenkov
Senior system engineer
From:
owner-toasters@mathworks.com [mailto:owner-toasters@mathworks.com] On Behalf Of
Sent: Wednesday, February 13, 2008
5:29 PM
To: Bill Holland;
toasters@mathworks.com
Subject: RE: De-dup'ing Primary
Storage
I would be
interested in knowing the impact of a-sis on cache hit % though. Since
you’re essentially changing pointers to other instances of blocks, those
de-duped blocks wouldn’t be located along with the other original blocks, so it
could affect the performance of onTap’s read-ahead algorithm.
From:
owner-toasters@mathworks.com [mailto:owner-toasters@mathworks.com] On Behalf Of Willeke, Jochen
Sent: Wednesday, February 13, 2008
8:01 AM
To: Bill Holland;
toasters@mathworks.com
Subject: RE: De-dup'ing Primary
Storage
Hi Bill,
we have ASIS on two of
our 6070's for some time. We did only few tests but could not see any direct
impact on the filers performance.
We have not yet used it
for LUNs so far, but would be interessted in experience with ASIS on LUNs as
well.
Regards
Jochen
From:
owner-toasters@mathworks.com [mailto:owner-toasters@mathworks.com] On Behalf Of Bill Holland
Sent: Wednesday, February 13, 2008
12:50 PM
To: toasters@mathworks.com
Subject: De-dup'ing Primary
Storage
To those of you that have implemented Nearstore and
A-SIS on your primary storage:
1. Have you seen any difference in overall filer
performance?
2. If you have LUNs, how are your space savings
on those volumes?
I know that enabling Nearstore does some system
tweaking in the background to increase the number of concurrent backup streams
that can be running, but I don't know what else it tweaks that may adversely
affect performance of a primary storage system. Afterall, it was
originally designed to run as a secondary storage platform.
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