From: Michael Monnerie <michael.monnerie@is.it-management.at>
To: xfs@oss.sgi.com
Subject: read slower than write on "mv"?
Date: Mon, 3 May 2010 10:54:28 +0200 [thread overview]
Message-ID: <201005031054.38817@zmi.at> (raw)
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This is not XFS specific, I see it on every filesys. I do a
"mv . /newlocation" and see this with iostat:
Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s avgrq-
sz avgqu-sz await svctm %util
xvdb 608,60 2,60 25967,20 102,40 85,31 5,37
8,77 1,58 96,72
xvdg 0,00 608,60 0,00 26532,10 87,19 7,55
12,41 0,12 7,44
Reading takes 97% I/O time, writing 7%. This is on the same raidset, but
I see the same when copying between two different single disks also. Or
is it just an effect of write caching that writes look faster than
reads?
--
mit freundlichen Grüssen,
Michael Monnerie, Ing. BSc
it-management Internet Services
http://proteger.at [gesprochen: Prot-e-schee]
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next reply other threads:[~2010-05-03 8:52 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-05-03 8:54 Michael Monnerie [this message]
2010-05-03 11:52 ` read slower than write on "mv"? Dave Chinner
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