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SubjectRe: Kernel SeekCompleteErrors... Different from Re: LibPATA code issues / 2.6.15.4
* Mark Lord (liml@rtr.ca) wrote:
> >>James Courtier-Dutton wrote:
> >>>
> >>>I have what looks like similar problems. The issue I have is that I
> >>
> >>Nope. Different issues.
> >I have changed the Subject line to indicate this so any future responses
> >can be indicated.
> >
> >>
> >>>) #1 Sat Dec 3 18:47:19 GMT 2005
> >>>Dec 16 22:51:57 games kernel: hdc: dma_intr: status=0x51 { DriveReady
> >>>SeekComplete Error }
> >>>Dec 16 22:52:32 games kernel: hdc: dma_intr: error=0x40 {
> >>>UncorrectableError }, LBAsect=53058185, sector=53057951
> >>
> >>The disk really does have bad sectors in this case (above).
> >The disk has NO bad sectors. It has been checked using two different tests.
>
> The *only* test that matters is to enable S.M.A.R.T.,
> and read out the error logs from it.

I have seen a set of drives that has reported UncorrectableErrors
and :
* Shows the Uncorrectable error in the SMART log
* Passes a full SMART test
* Shows no remapped sectors
* Passes the vendors drive test
* Now fully passes a dd if=/dev/hdx of=/dev/null with no errors.

They were a set of 250GB SATA drives by the same vendor; I've taken
them out one at a time as each did the same thing and replaced them
with another vendors drive. They were all in use in RAID-1 MD
configuration (under heavy load).

I do wonder about the 'uncorrectable error rate' that vendors report;
it doesn't seem very large - but I'll admit to not understanding its
units. Are soft non-repeatable uncorrectable errors expected in
principal? (Pointers to a good explanation of what this actually
means would be appreciated).

I do wonder how often this happens to people and if the read succeeds
again they just blame it on software.

Dave
--
-----Open up your eyes, open up your mind, open up your code -------
/ Dr. David Alan Gilbert | Running GNU/Linux on Alpha,68K| Happy \
\ gro.gilbert @ treblig.org | MIPS,x86,ARM,SPARC,PPC & HPPA | In Hex /
\ _________________________|_____ http://www.treblig.org |_______/
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