From: Roman Mamedov <rm@romanrm.net>
To: Mateusz Korniak <mateusz-lists@ant.gliwice.pl>
Cc: linux-raid@vger.kernel.org
Subject: Re: RAID5/6 slow due to a member device -- how to diagnose?
Date: Thu, 3 Mar 2016 20:00:16 +0500 [thread overview]
Message-ID: <20160303200016.2d3da705@natsu> (raw)
In-Reply-To: <4472129.pebMKxQj7W@matkor-toshiba>
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On Thu, 03 Mar 2016 15:35:21 +0100
Mateusz Korniak <mateusz-lists@ant.gliwice.pl> wrote:
> On Thursday 03 March 2016 19:30:26 Roman Mamedov wrote:
> > But is that broken down somewhere to show which particular block device is
> > being the most 'waited for'?
>
> iostat ?
>
> r_await w_await svctm %util columns?
Cheers -- never knew there was this 'extended' output mode in iostat.
Indeed it pinpoints the culprit nicely.
Device: [...] wkB/s avgrq-sz avgqu-sz await r_await w_await svctm %util
sde1 [...] 53748.00 969.01 1.95 17.46 68.00 17.00 4.09 45.40
sdf1 [...] 49410.75 1176.97 32.09 393.95 106.00 397.42 11.90 100.00
sdg1 [...] 50230.00 995.17 7.12 66.81 88.00 66.60 6.08 61.40
sdh1 [...] 53110.00 970.89 2.46 22.21 46.40 21.64 4.64 50.80
--
With respect,
Roman
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next prev parent reply other threads:[~2016-03-03 15:00 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-03-03 14:30 RAID5/6 slow due to a member device -- how to diagnose? Roman Mamedov
2016-03-03 14:35 ` Mateusz Korniak
2016-03-03 15:00 ` Roman Mamedov [this message]
2016-03-03 14:37 ` Carlos Carvalho
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