Message-ID: <45C3C1FC.8020500@rtr.ca>
Date: Fri, 02 Feb 2007 17:58:04 -0500
From: Mark Lord <liml@rtr.ca>
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To: Matt Mackall <mpm@selenic.com>
Cc: Alan <alan@lxorguk.ukuu.org.uk>, Ric Wheeler <ric@emc.com>,
       James Bottomley <James.Bottomley@HansenPartnership.com>,
       linux-kernel@vger.kernel.org,
       IDE/ATA development list <linux-ide@vger.kernel.org>,
       linux-scsi <linux-scsi@vger.kernel.org>
Subject: Re: [PATCH] scsi_lib.c: continue after MEDIUM_ERROR
References: <200701301947.08478.liml@rtr.ca> <1170206199.10890.13.camel@mulgrave.il.steeleye.com> <45C2474E.9030306@rtr.ca> <1170366920.3388.62.camel@mulgrave.il.steeleye.com> <45C32C7F.9050706@emc.com> <20070202145003.525bd682@localhost.localdomain> <45C3617B.2020400@rtr.ca> <20070202194956.GF16722@waste.org>
In-Reply-To: <20070202194956.GF16722@waste.org>
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Matt Mackall wrote:
> ..
> Also worth considering is that spending minutes trying to reread
> damaged sectors is likely to accelerate your death spiral. More data
> may be recoverable if you give up quickly in a first pass, then go
> back and manually retry damaged bits with smaller I/Os.

All good input.  But what was being debated here is not so much
the retrying of known-bad sectors, but rather what to do about
the kiBs or MiBs of sectors remaining in a merged request after
hitting a single bad sector mid-way.

Currently, SCSI just abandons the entire remaining workload.

Cheers
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