Re: Driver retries disk errors.

[Erik Mouw]

On Tue, Aug 31, 2004 at 03:12:52PM +0100, Alan Cox wrote:
> On Maw, 2004-08-31 at 14:54, Rogier Wolff wrote:
> > How about we set the num-retries to 1, and increase to 8 for
> > "weird devices" (floppy, MO), and older drives. 
> 
> Disagree. I want it robust. If you want to set low retry counts then
> the user should do so for special cases like forensics.

The SCSI disk driver has been doing a single retry for quite some time
and it hasn't really bitten people. Why would the IDE disk driver be
different? The only case I can imagine a retry would be OK, is when we
get an UDMA CRC error (caused by bad cables).

(OK, for SCSI drives you have a lot more control about how a drive
should treat errors, but the kernel will not retry a block when the
drive reported it's bad.)


Erik

-- 
+-- Erik Mouw -- www.harddisk-recovery.com -- +31 70 370 12 90 --
| Lab address: Delftechpark 26, 2628 XH, Delft, The Netherlands
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