Re: SMART problems in 2.6.22

[Bruce Allen <ballen@gravity.phys.uwm.edu>]

On Tue, 10 Jul 2007, Douglas Gilbert wrote:

> Kai Makisara wrote:

> > I have done some more debugging on this one. An easy way to reproduce 
> > the

<SNIP>

> > The log shows that the sense data returned by the commands differ: with 
> > 2.6.22 the bytes 4f and 2c (tf.lbam and tf.lbah) are not returned. Both 
> > of the status commands fail to return these bytes but the tests in 
> > smartctl are more strict for the second case. This is why the second 
> > status command seems to be failing.

<SNIP>

> Kai, Thanks for the analysis.

<SNIP>

> So when smartmontools sees 0 and 0 in those positions it pulls out the 
> red card for that device. My guess is that libata in lk 2.6.22 is 
> corrupting those FIS device to host register values.

Kai, Doug: thank you very much for tracking down the source of this 
problem.

Jeff: OK, from what I am reading here I think that this is a genuine 
libata/kernel bug.  But I'm out of my depth here, so the ball is in your 
court.  Hopefully you'll understand what's going on and how to fix it.

Cheers,
	Bruce
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