linux-kernel - Re: Raid reconstructing and process hanging in D state

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Message-ID: <Pine.LNX.4.64.0910160840400.2463@praktifix.dwd.de>
Date:	Fri, 16 Oct 2009 08:44:50 +0000 (GMT)
From:	Holger Kiehl <Holger.Kiehl@....de>
To:	Justin Piszcz <jpiszcz@...idpixels.com>
cc:	linux-raid <linux-raid@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: Raid reconstructing and process hanging in D state

On Fri, 16 Oct 2009, Justin Piszcz wrote:
> Hi,
>
> I have the same problem with mdadm/raid-1, if you do not limit the speed in 
> the speed_limit_min paramter, it will starve the I/O from all other processes 
> and result in the same problem you are having.
>
But in my case speed_limit_min was set to 1000 and speed_limit_max was 200000
(ie. the default) and this still caused all process to hang in D-state. Only
lowering speed_limit_max helped to make the system responsive again.

> But for me I'm not sure about the reconstruction-- this happens for me during 
> a raid verify/check.
>
This was also the case for me, during a raid verify/check.

Holger
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