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Subject: Re: libata: dma, io error messages
From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: Paul Jakma <paul@clubi.ie>
Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
In-Reply-To: <Pine.LNX.4.60.0408061113210.2622@fogarty.jakma.org>
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Date: Fri, 06 Aug 2004 13:32:46 +0100
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On Gwe, 2004-08-06 at 11:29, Paul Jakma wrote:
> scsi0: ERROR on channel 0, id 0, lun 0, CDB: Read (10) 00 02 05 d0 06 00 00 10 00
> Current sda: sense key Medium Error

Disk error

> Additional sense: Unrecovered read error - auto reallocate failed

Bad block, and sufficiently bad that it couldn't then recover the block
and rewrite it. When a drive sees a marginal read (lot of forward error
correction recovery needed) it will try and rewrite or move the block.

In this case it couldn't read the block enough to move it.

> Also, the drive is extremely slow now, about 1MB/s drive transfer 
> rate as reported by hdparm -T.

Sounds like it dropped to PIO - that may be a bug triggered by the drive
failing.