Leslie Rhorer wrote:
for f in /sys/block/*/queue/scheduler; do
echo noop > $f
echo $f "$(cat $f)"
done
OK, I did this. Two questions:
It doesn't seem to have helped or hindered. I still get halts, but under
moderate loads not every time.
Leslie: I still think finding out what the kernel is doing during the
stall would be a HUGE hint to the problem. Did you look into oprofile or
ftrace?
I couldn't find a Debian source for ftrace, but I did download oprofile.
Something very disturbing is happening now, however. Just a few minutes
after loading oprofile, the system did a sudden total shutdown. The file
systems were all left dirty, and power was suddenly cut to the main chassis.
This has never happened before. I rebooted the system, and the file systems
replayed their journals. Some data was lost, of course, but nothing
serious. A few hours later, the exact same thing happened again: A sudden
shut-down. Nothing like this has ever happened before. Of course the
system can issue a power shutdown from software, but it is supposed to clean
up the file systems first, and it's not supposed to just do it autonomously.
Just for grins, is this system by any chance on a UPS? Because I found
an interesting failure mode if that's the case.
--
bill davidsen <davidsen@xxxxxxx>
CTO TMR Associates, Inc
"You are disgraced professional losers. And by the way, give us our money back."
- Representative Earl Pomeroy, Democrat of North Dakota
on the A.I.G. executives who were paid bonuses after a federal bailout.
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