From mboxrd@z Thu Jan  1 00:00:00 1970
From: NeilBrown <neilb@suse.de>
Subject: Re: md raid6 deadlock on write
Date: Wed, 4 Jul 2012 11:38:11 +1000
Message-ID: <20120704113811.180be107@notabene.brown>
References: <20120629194600.GA23859@calhariz.com>
	<20120702221508.GA24801@calhariz.com>
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On Mon, 2 Jul 2012 23:15:08 +0100 Jose Manuel dos Santos Calhariz
<jose.calhariz@netvisao.pt> wrote:

>=20
> We have a group of servers with a LVM over a RAID6 of 16 drives.
> During normal work loads, sometimes, the md raid enter on deadlock for
> writes and only a power off/power on allows to recover the machine.

This might be fixed by the following commit which was recently included in
3.5-rc. If could test with that I'd appreciate it.

>=20
>   - there is information from "SysRq : Show State", not attached
>     because is too big,

How big is too big?  It is very hard to see if there is anything useful in
there if I cannot see it....

NeilBrown


>=20
>   - in attach the output of "iostat -dx 1",
>=20
>   - the "avgqu-sz" of the logical volume used for fio tests was
>     76280.00,
>=20
>   - in attach the output of "ps ax".
>=20
>=20
>         Jose Calhariz
>=20
>=20
>=20
>=20


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