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

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Date:	Wed, 31 Jan 2007 10:38:47 -0500
From:	Mark Lord <liml@....ca>
To:	dougg@...que.net
Cc:	ric@....com, Jeff Garzik <jeff@...zik.org>,
	"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>
Subject: Re: [PATCH] scsi_lib.c: continue after MEDIUM_ERROR

Douglas Gilbert wrote:
>
> Ric,
> Both ATA (ATA8-ACS) and SCSI (SBC-3) have recently added
> command support to flag a block as "uncorrectable". There
> is no need to send bad "long" data to it and suppress the
> disk's automatic re-allocation logic.

That'll be useful in a couple of years, once drives that have it
become more common.  For now, though, we're hacking current drives
using READ/WRITE LONG commands, with a corresponding patch to libata
to allow for the longer "sector size" involved.

Having real bad sectors, exactly where we want them on the media,
sure does make testing / fixing the EH mechanisms a lot more feasible.

Cheers

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