Re: libata: dma, io error messages

[Jeff Garzik]

Alan Cox wrote:
> 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.


Unfortunately, in libata all it means at this point is
(a) the error occurred on a read command, and
(b) we did not attempt to retry the command

So, a generic non-specific error you see on all errors.

libata does not (yet) retry cable errors, for example.  Paul, don't 
automatically assume the disk is bad, try swapping cables.

	Jeff


-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/