linux-kernel - Re: [PATCH] scsi_lib.c: continue after MEDIUM

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Date:	Wed, 31 Jan 2007 11:35:14 -0500
From:	Ric Wheeler <ric@....com>
To:	Alan <alan@...rguk.ukuu.org.uk>
CC:	Mark Lord <liml@....ca>, "Eric D. Mudama" <edmudama@...il.com>,
	James Bottomley <James.Bottomley@...senpartnership.com>,
	linux-kernel@...r.kernel.org,
	IDE/ATA development list <linux-ide@...r.kernel.org>,
	linux-scsi <linux-scsi@...r.kernel.org>, dougg@...que.net
Subject: Re: [PATCH] scsi_lib.c: continue after MEDIUM_ERROR



Alan wrote:
>> When libata reports a MEDIUM_ERROR to us, we *know* it's non-recoverable,
>> as the drive itself has already done internal retries (libata uses the
>> "with retry" ATA opcodes for this).
> 
> This depends on the firmware. Some of the "raid firmware" drives don't
> appear to do retries in firmware.

I think that even for these devices, the actual drives behind the controller 
will do retries. In any case, it would be reasonable to be able to set this 
retry/no-retry via /sys to handle exceptional cases...

> 
>> But meanwhile, we still have the original issue too, where a single stray
>> bad sector can blow a system out of the water, because the mid-layer
>> currently aborts everything after it from a large merged request.
>>
>> Thus the original patch from this thread.  :)
> 
> Agreed


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