From: Michael Monnerie <michael.monnerie@is.it-management.at>
To: xfs@oss.sgi.com
Subject: disk performance strange/low
Date: Mon, 17 Aug 2009 23:11:07 +0200 [thread overview]
Message-ID: <200908172311.07660@zmi.at> (raw)
I've got an Areca RAID Controller with 5x 1TB disks, and in the last
time I often found it to be strange. Now I investigated, and found this.
>From another server I NFS mount a share, and make
dd if=/dev/sda of=/server/share/test.dd bs=1024k
so that should do big sequential writes. But the performance goes up and
down, like you see in this output from "iostat -kx 5 555". You see write
KB/s is 5824, 23207, 87283, 704, 40187. Up and down all the time. Could
that be solved by the patch you discussed last time, or is there
something else?
Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s avgrq-
sz avgqu-sz await svctm %util
sdb 0,00 401,20 1,20 77,09 4,78 5824,00
148,91 152,25 2595,77 12,76 99,92
avg-cpu: %user %nice %system %iowait %steal %idle
0,00 0,00 34,77 67,03 2,20 7,21
sdb 0,00 1094,40 2,20 245,80 8,80 23207,20
187,23 153,64 43,24 4,03 100,00
avg-cpu: %user %nice %system %iowait %steal %idle
0,00 0,00 41,08 56,83 0,30 15,65
sdb 0,00 295,20 6,40 791,20 25,60 87283,40
218,93 119,19 259,89 1,21 96,56
avg-cpu: %user %nice %system %iowait %steal %idle
0,00 0,00 61,45 55,92 0,50 4,62
sdb 0,00 3,60 0,00 4,60 0,00 704,80
306,43 140,01 2979,30 217,39 100,00
avg-cpu: %user %nice %system %iowait %steal %idle
0,00 0,00 21,12 75,50 0,10 10,06
sdb 0,00 1252,80 0,20 270,00 0,80 40187,20
297,47 151,38 1160,49 3,70 99,84
mfg zmi
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next reply other threads:[~2009-08-17 21:11 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-08-17 21:11 Michael Monnerie [this message]
2009-08-17 21:41 ` disk performance strange/low Christoph Hellwig
2009-08-18 2:08 ` Michael Monnerie
2009-08-18 2:43 ` Christoph Hellwig
2009-08-26 17:20 ` Michael Monnerie
2009-08-26 17:56 ` Christoph Hellwig
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