From: NeilBrown <neilb@suse.de>
To: Pawel Sikora <pawel.sikora@agmk.net>
Cc: linux-kernel@vger.kernel.org, gregkh@linuxfoundation.org,
arekm@pld-linux.org
Subject: Re: [3.2.2] tasks blocked during matrix auto checking.
Date: Tue, 7 Feb 2012 09:47:51 +1100 [thread overview]
Message-ID: <20120207094751.51e5321a@notabene.brown> (raw)
In-Reply-To: <2156863.jdbU24e2Kr@pawels>
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On Mon, 06 Feb 2012 13:02 +0100 Pawel Sikora <pawel.sikora@agmk.net> wrote:
> Hi,
>
> on heavy loaded opterons i've noticed some blocked tasks during matrix auto checking.
> is it a known issue?
No.... maybe not too surprising though.
The data-check will pause to let other IO through, but if there is lots of IO
queued up it could cause some longish delays...
2 minutes does seem a bit long though, so maybe there is a bug somewhere.
And had 3 consecutive timeouts, so that makes it 6 minutes which really is
too long.
What sort of array was this? RAID1? RAID5 ??
Thanks,
NeilBrown
>
> (...)
> [401836.109354] md: data-check of RAID array md0
> [401836.109364] md: minimum _guaranteed_ speed: 1000 KB/sec/disk.
> [401836.109368] md: using maximum available idle IO bandwidth (but not more than 200000 KB/sec) for data-check.
> [401836.109388] md: using 128k window, over a total of 8000256k.
> [401836.111441] md: delaying data-check of md2 until md0 has finished (they share one or more physical units)
> [401914.274728] md: md0: data-check done.
> [401914.293562] md: data-check of RAID array md2
> [401914.293566] md: minimum _guaranteed_ speed: 1000 KB/sec/disk.
> [401914.293569] md: using maximum available idle IO bandwidth (but not more than 200000 KB/sec) for data-check.
> [401914.293589] md: using 128k window, over a total of 849514496k.
> [402723.026480] INFO: task kjournald:1546 blocked for more than 120 seconds.
> [402723.026484] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
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next prev parent reply other threads:[~2012-02-06 22:48 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-02-06 12:02 [3.2.2] tasks blocked during matrix auto checking Pawel Sikora
2012-02-06 22:47 ` NeilBrown [this message]
2012-02-07 5:58 ` Paweł Sikora
2012-04-01 12:49 ` [PING] " Paweł Sikora
2012-04-02 2:43 ` NeilBrown
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