linux-kernel - Re: [3.2.2] tasks blocked during matrix auto checking.

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Date:	Tue, 07 Feb 2012 06:58:39 +0100
From:	Paweł Sikora <pawel.sikora@...k.net>
To:	NeilBrown <neilb@...e.de>
Cc:	linux-kernel@...r.kernel.org, gregkh@...uxfoundation.org,
	arekm@...-linux.org
Subject: Re: [3.2.2] tasks blocked during matrix auto checking.

On Tuesday 07 of February 2012 09:47:51 NeilBrown wrote:
> On Mon, 06 Feb 2012 13:02 +0100 Pawel Sikora <pawel.sikora@...k.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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