linux-kernel - Re: MD/RAID time out writing superblock

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Date:	Mon, 14 Sep 2009 22:05:10 +0900
From:	Tejun Heo <teheo@...e.de>
To:	Mark Lord <liml@....ca>
Cc:	Chris Webb <chris@...chsys.com>, linux-scsi@...r.kernel.org,
	Ric Wheeler <rwheeler@...hat.com>,
	Andrei Tanas <andrei@...as.ca>, NeilBrown <neilb@...e.de>,
	linux-kernel@...r.kernel.org,
	IDE/ATA development list <linux-ide@...r.kernel.org>,
	Jeff Garzik <jgarzik@...hat.com>, Mark Lord <mlord@...ox.com>
Subject: Re: MD/RAID time out writing superblock

Mark Lord wrote:
> Tejun Heo wrote:
> ..
>> Oooh, another possibility is the above continuous IDENTIFY tries.
>> Doing things like that generally isn't a good idea because vendors
>> don't expect IDENTIFY to be mixed regularly with normal IOs and
>> firmwares aren't tested against that.  Even smart commands sometimes
>> cause problems.  So, finding out the thing which is obsessed with the
>> identity of the drive and stopping it might help.
> ..
> 
> Bullpucky.  That sort of thing, specifically with IDENTIFY,
> has never been an issue.

With SMART it has.  I wouldn't be too surprised if some new firmware
chokes on repeated IDENTIFY mixed with stream of NCQ commands.  It's
just not something people (including vendors) do regularly.

> I wonder if the IDENTIFY is actually coming from libata EH
> after something else failed ?

In that case, libata-eh would print "ataP.DD: failed to IDENTIFY
(blah, err_mask=0x%x\n" instead of the full TF dump.

Thanks.

-- 
tejun
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