From: Harald Nikolisin <hochglanz@gmail.com>
To: linux-raid@vger.kernel.org
Subject: Device utilization with RAID-1
Date: Tue, 16 Aug 2011 02:39:47 +0200 [thread overview]
Message-ID: <4E49BC53.8040604@googlemail.com> (raw)
Since a long time I'm unhappy with the performance of my RAID-1 system.
Investigation with atop and iostat unveils that the disk utilization is
always on a certain level although nothing happens on the system. In the
case of reading or writing files the utilization boosts always to 100%
for a long time. Very ugly examples are "Firefox starting" or "zypper
updates".
That is snapshot of the output of iostat:
Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s
avgrq-sz avgqu-sz await svctm %util
sda 0,00 0,00 0,00 7,33 0,00 43,33
5,91 0,33 43,18 33,32 24,43
sdb 0,00 0,00 0,00 7,33 0,00 43,33
5,91 0,35 45,59 39,73 29,13
md0 0,00 0,00 0,00 0,67 0,00 5,33
8,00 0,00 0,00 0,00 0,00
md1 0,00 0,00 0,00 0,33 0,00 5,33
16,00 0,00 0,00 0,00 0,00
md2 0,00 0,00 0,00 0,33 0,00 1,00
3,00 0,00 0,00 0,00 0,00
md3 0,00 0,00 0,00 0,00 0,00 0,00
0,00 0,00 0,00 0,00 0,00
md4 0,00 0,00 0,00 0,00 0,00 0,00
0,00 0,00 0,00 0,00 0,00
md5 0,00 0,00 0,00 0,33 0,00 0,67
2,00 0,00 0,00 0,00 0,00
I checked with mdadm if a resync happens or so, but this is not the
case. The state says "active" on all RAID devices - btw. what is the
difference to "clean" ?
thanks for any hints,
harald
next reply other threads:[~2011-08-16 0:39 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-08-16 0:39 Harald Nikolisin [this message]
2011-08-16 1:30 ` Device utilization with RAID-1 Roberto Spadim
[not found] ` <CABYL=TqYhDSFTx9Bq6_AWZaYd+qtbd=tJyTHJUjXwYHH_qkQnQ@mail.gmail.com>
2011-08-16 17:25 ` Harald Nikolisin
-- strict thread matches above, loose matches on Subject: below --
2011-08-18 0:26 Fwd: " Harald Nikolisin
2011-08-18 1:42 ` NeilBrown
2011-08-18 6:44 ` Stefan /*St0fF*/ Hübner
2011-08-18 13:44 ` CoolCold
2011-08-19 0:31 ` NeilBrown
2011-08-19 18:32 ` maurice
2011-08-20 3:13 ` John Robinson
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