Re: Kernel bug or disk failure

[Sam Varshavchik <mrsam@xxxxxxxxxxxxxxx>]

Todd Denniston writes:

> Sam Varshavchik wrote, On 07/13/2008 10:51 AM:
> > Chris Snook writes:
> >
> > > Sam Varshavchik wrote:
> > > > Every other week or so, I get a disk kicked out of my RAID, with this:
> > > >
> > > > Jul  6 04:05:38 commodore kernel: (scsi1:A:0:0): scsi1: device 
> > > > overrun (status 10) on 0:0:0
> > > > Jul  6 04:05:38 commodore kernel: Unexpected busfree in DT Data-in 
> > > > phase, 1 SCBs aborted, PRGMCNT == 0x22f
> > > > Jul  6 04:05:38 commodore kernel: >>>>>>>>>>>>>>>>>> Dump Card State 
> > > > Begins <<<<<<<<<<<<<<<<<
> > > > Jul  6 04:05:38 commodore kernel: scsi1: Dumping Card State at 
> > > > program address 0x22d Mode 0x22
> > > > Jul  6 04:05:38 commodore kernel: Card was paused
> > > >
> > > > … followed by a rather dry dump of the HBA's registers. This is 
> > > > aic79xxx.
> > > >
> > > > This does not look like a disk error to me. I re-add the drive into 
> > > > the array, and rebuild with no downtime. SMART shows 0 in the defect 
> > > > list on this drive, and over the disk's lifetime 0 uncorrectable 
> > > > reads and 1 uncorrectable write -- but this kernel barf already 
> > > > happened 4-5 times now, and it's getting rather annoying.
> > >
> > > Looks more like a controller problem than a drive problem.  Do you 
> > > have a spare HBA to test?
> >
> > No, but I have one on order, now. I reseated the cable, that didn't help 
> > -- the card dumped again about 12 hours later, but it was, apparently, 
> > non-fatal because RAID did not degrade.
>
> May I suggest that, when it is convenient to do so, you:
> 1) reboot
> 2) Catch the scsi card ( Ctrl-A ) when the aic79xxx boot text shows up during 
> bios operations.
> 3) set the speed of the scsi bus to that drive to a little slower.
> 4) if you get the fault or the drive is not recognized, repeat until you get a 
> desired result (some drives do not work at ALL the speeds slower than it is 
> rated at, Promise U160 rated array communicated only at 160, 80, 66, 16 & 6).

I'll try that if the replacement card still trips like this. These drives 
have been spinning away, 24x7, for a few years, with nary a hiccup.

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