From: =?utf-8?B?UGF3ZcWC?= Sikora <pawel.sikora@agmk.net>
To: NeilBrown <neilb@suse.de>
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, 07 Feb 2012 06:58:39 +0100
Message-ID: <4142598.MA7Zy4QWhf@vmx>
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On Tuesday 07 of February 2012 09:47:51 NeilBrown wrote:
> 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 ??

~810GB in raid-10:

md2 : active raid10 sda4[0] sdd4[3] sdc4[2] sdb4[1]
      849514496 blocks super 1.2 512K chunks 2 far-copies [4/4] [UUUU]

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