Problem with FreeBSD 4.9-Release resetting itself!

[rtsit]

I've got a problem with FreeBSD 4.9-RELEASE resetting
itself. This is a production system that has been
running fine for over a year.

It seems to be linked to a disk error of some sort. I
often see log file entries like this:

Sep 23 00:00:46 nfs2 /kernel: ad0: timeout sending
command=c8 s=80 e=00
Sep 23 00:00:46 nfs2 /kernel: ad0: error executing
command - resetting
Sep 23 00:00:46 nfs2 /kernel: ata0: resetting devices
.. ad0: DMA limited to UDMA33, non-ATA66 cable or
device
Sep 23 00:00:46 nfs2 /kernel: don

Sep 29 11:49:01 nfs2 /kernel: ad0: READ command
timeout tag=0 serv=0 - resetting
Sep 29 11:49:01 nfs2 /kernel: ata0: resetting devices
.. ad0: DMA limited to UDMA33, non-ATA66 cable or
device
Sep 29 11:49:01 nfs2 /kernel: done

Oct  9 21:40:55 nfs2 /kernel: ad0: READ command
timeout tag=0 serv=0 - resetting
Oct  9 21:40:55 nfs2 /kernel: ata0: resetting devices
.. ad0: DMA limited to UDMA33, non-ATA66 cable or
device


All I can figure is that the FreeBSD system is trying
to read/write to ad0 (my primary HD) and there's an
error of some sort, so it waits a bit and then resets
the entire system.

When I do an fsck, it comes out fine. So it's
definately some sort of weird intermittent problem.

Is my HD toast, or is FreeBSD acting stupid
unnecessarily?



	
		
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