SCSI messages - should I be worried?

[Dave Ewart]

On Wednesday, 29.07.2009 at 15:02 +0100, Dave Ewart wrote:

> On Wednesday, 29.07.2009 at 08:37 -0500, Patrick_Boyd at Dell.com wrote:
> 
> > Sense Key / Code / Qualifier / Reason
> > 6 / 29 / 02       SCSI BUS RESET OCCURRED - Perfectly normal occurance.
> > The bus gets reset if a device returns an unexpected answer or there are
> > arbitration problems, nothing to worry about. It happens.
> > 6 / 29 / CD		This one is vendor specific, but 6 / 29 means
> > device reset as well. This probably indicates that the card tried
> > talking to the device before it finished it's reset. Again nothing to
> > worry about.
> > 2 / 04 / 01		Logical unit in process of becoming ready - This
> > can happen during power on or after a reset. Again expected, nothing
> > wrong with the disk.
> 
> Thanks for the reply, Patrick: much appreciated.
> 
> > I don't see anything that would bother me here. If you start seeing
> > Sense key's of 1, 3, or 4 then you may have problems, but the RAID card
> > should flag the disk as bad long before that happens.
> 
> Understood.
> 
> > Sense codes happen in the SCSI realm all the time and 90% of the time
> > are nothing to worry about.
> 
> My concern is really the fact that we've been running this PowerVault
> for six months without *any* SCSI sense messages being logged at all -
> even if they are considered normal - then suddenly two days' ago we
> started getting them by the bucket load.
> 
> This is the real issue, I guess.  Does the fact that this behaviour has
> suddenly begun - and always relating to the same physical disk - not
> suggest that there may be something wrong here?  Either with the disk,
> or with the enclosure slot relating to it?

Hah, well, about 30 seconds after I posted the above, the disk in fact
failed.

I am now no longer _concerned_ the disk will fail :-D

Dave.

-- 
Dave Ewart
davee at ceu.ox.ac.uk
Computing Manager, Cancer Epidemiology Unit
University of Oxford / Cancer Research UK
PGP: CC70 1883 BD92 E665 B840 118B 6E94 2CFD 694D E370
Get key from http://www.ceu.ox.ac.uk/~davee/davee-ceu-ox-ac-uk.asc
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