Quoting Matthew Emmerton <[EMAIL PROTECTED]>:
> [ cc'ing Soren since he's the ATA guru ]
> > Dec 30 23:27:00 ecserv13 /kernel: ad0: trying fallback to PIO mode
> > Dec 30 23:27:00 ecserv13 /kernel: ata0: resetting devices .. done
> > The test continues to run with the ata controller in PIO mode, with
> > slower performance, and higher load average.
> > Once the master drops to PIO, attempts to access the slave then cause
> > it to drop to PIO.
> Are you using 80-conductor cables on all your drives? These are required to
> get consistent high throughput, and running without them may cause the
> problems you're seeing.
Thanks for the information about the design of IDE etc, and the suggestion
about the cables. I was about to shuffle things to get the disks
onto separate channels, but I now see that would be a mistake as my
CD drive would share a cable with a disk.
Anyway, they all have the 80 conductor cable. I forgot to add some
environmental and other information.
The 4 AMD systems are in Aopen hx08 towers, with 400 watt power supplies,
and 5 auxilliary fans (in addition to the power supply fan, and fan on
each cpu). They are in an air conditioned machine room. The CPU and
motherboard temperatures are within spec. I mention this as I note
many reported AMD system problems traced to overheating.
All drives are installed in removeable drive bays. I don't have the make/model
on hand right now. They were $19 CAD. ($13USD). The low cost makes
me suspicious now, but...
I'm running the same tests on 4 single processor 2.4GHz Intel systems.
They have not failed in this manner so far.
Initially, I had 1GB memory modules in the AMD systems (I can't remember
the make) and the systems froze and rebooted randomly. I moved to
Crucial 512MB modules to cure that problem.
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