Re: Disk stuck in error recovery loop with AHCI

[Jim Paris <jim@jtan.com>]

Tejun Heo wrote:
> Jim Paris wrote:
> > Still, it seems that some improvements could be made to the EH when
> > this sort of thing happens.  For example, after "speed down requested
> > but no transfer mode left" a few times in a row, maybe it would make
> > sense to just fail the disk and give up.  That would have allowed
> > higher layers like MD to recover.
> 
> That's SD retrying sector-by-sector a large request as libata doesn't
> report proper failed sector info.  Please try 2.6.20.  md will fail the
> drive after a few errors.

Hi Tejun,

It was 2.6.20.  The system was stuck repeating EH for about half an
hour before I physically pulled the disk to get MD to fail the device
and to bring the system back to a responsive state.

> Patches to improve EH behavior further went into 2.6.21 devel tree and
> some are pending.

Great, I've hopefully eliminated the cause of my errors but I'll give
that a try if I run into this again.

-jim