From: Michael Monnerie <michael.monnerie@is.it-management.at>
To: xfs@oss.sgi.com
Cc: Richard Scobie <richard@sauce.co.nz>
Subject: Re: XFS over LVM over md RAID
Date: Fri, 10 Sep 2010 02:25:55 +0200 [thread overview]
Message-ID: <201009100225.55562@zmi.at> (raw)
In-Reply-To: <4C89668E.6010800@sauce.co.nz>
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On Freitag, 10. September 2010 Richard Scobie wrote:
> Limited testing using dd and bonnie++ shows no difference in write
> performance
For dd it should always show the same, as you just sequentially write a
large file. Only with bonnie you would see differences due to stripe
sets, as the speed only drops when doing I/O not on boundaries and/or
smaller than the stripe size, as the stripe size is the smallest
possible I/O for the RAID.
I don't know why you don't see any difference with bonnie though.
FWIW, a stripe set of 256k means you do read/write 256k from a single
drive on each I/O, then the next 256k from the next drive. I hope you
have very few small accesses and mostly very large files. If you'd use a
database on that system it would crawl...
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next prev parent reply other threads:[~2010-09-10 0:25 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-09-09 22:58 XFS over LVM over md RAID Richard Scobie
2010-09-10 0:25 ` Michael Monnerie [this message]
2010-09-10 0:52 ` Richard Scobie
2010-09-10 1:14 ` Richard Scobie
2010-09-10 1:30 ` Dave Chinner
2010-09-10 2:29 ` Richard Scobie
2010-09-10 14:24 ` Eric Sandeen
2010-09-10 21:42 ` Richard Scobie
2010-09-10 22:19 ` Stan Hoeppner
-- strict thread matches above, loose matches on Subject: below --
2010-09-10 23:08 Richard Scobie
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