From: Harald Nikolisin <hochglanz@gmail.com>
To: linux-raid@vger.kernel.org
Subject: Fwd: Re: Device utilization with RAID-1
Date: Thu, 18 Aug 2011 02:26:17 +0200 [thread overview]
Message-ID: <4E4C5C29.6040303@googlemail.com> (raw)
hi,
I didn't want to complain in general about SW RAID-1 performance. I
simply think something is wrong with my setup and I have currently no
idea how to improve.
The basic questions (where I did not find an answer, neither in FAQ's
nor in forum discussions) are.
a) Is it normal that the hard drives show an permanent utilization
(around 20%) without any noticeable actions on the computer?
b) Should (as long as no resync happens) the state of mdadm active or clean?
cheers,
harald
well, I have only 2 hard drives and no space for more..
Am 16.08.2011 03:29, schrieb Roberto Spadim:
> try raid10 far layout
>
> 2011/8/15 Harald Nikolisin <hochglanz@gmail.com
> <mailto:hochglanz@gmail.com>>
>
> 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
> --
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>
>
>
> --
> Roberto Spadim
> Spadim Technology / SPAEmpresarial
next reply other threads:[~2011-08-18 0:26 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-08-18 0:26 Harald Nikolisin [this message]
2011-08-18 1:42 ` Device utilization with RAID-1 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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