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

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Date:	Mon, 31 Aug 2009 19:45:37 -0400
From:	Mark Lord <liml@....ca>
To:	Mark Lord <mlord@...ox.com>
Cc:	Tejun Heo <tj@...nel.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>,
	linux-scsi@...r.kernel.org, Jeff Garzik <jgarzik@...hat.com>
Subject: Re: MD/RAID time out writing superblock

Mark Lord wrote:
> Tejun Heo wrote:
>> Ric Wheeler wrote:
> ..
>>> The drive might take a longer time like this when doing error handling
>>> (sector remapping, etc), but then I would expect to see your remapped
>>> sector count grow.
>>
>> Yes, this is a possibility and according to the spec, libata EH should
>> be retrying flushes a few times before giving up but I'm not sure
>> whether keeping retrying for several minutes is a good idea either.
>> Is it?
> ..
> 
> Libata will retry only when the FLUSH returns an error,
> and the next FLUSH will continue after the point where
> the first attempt failed.
> 
> But if the drive can still auto-relocate sectors, then the
> first FLUSH won't actually fail.. it will simply take longer
> than normal.
> 
> A couple of those, and we're into the tens of seconds range
> for time.
> 
> Still, it would be good to actually produce an error like that
> to examine under controlled circumstances.
> 
> Hmm.. I had a drive here that gave symptoms like that.
> Eventually, I discovered that drive had run out of relocatable
> sectors, too.  Mmm.. I'll see if I can get it back (loaned it out)
> and perhaps we can recreate this specific scenario on it..
..

I checked today, and that drive is no longer available.

-ml
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