(CC'ing to freebsd-hackers, since a previous discussion took place there.)
Thanks. I tried pinging the machine after a hang, but no response.
After a bit of experimentation it seems that the hang (at least on the AMD)
occurs under write activity. (A yes /tmp/foo hangs it.) It seems to hold up
under read loads.
I'm hoping someone on the lists has either a workaround/fix or could maybe say
I've hit this, but when I switched to a non-maxtor drive things worked.
- Jason
On Sat, Nov 02, 2002 at 10:12:09PM -0800, Jeff Jirsa wrote:
On Sat, 2 Nov 2002, Jason Godfrey wrote:
Basically under heavy disk load (buildworld, large package install, nightly
script run) the system will hang hard. The two systems have very little in
common, one is a P2 400 running FreeBSD-Stable from Oct 2, the other (a new
machine) is a AMD 1600+ running FreeBSD 4.5-Release. The faster machine seems
to hit the hange much more regularly.
The only thing in common between the two machines I can think of is that they
both have Maxtor IDE drives on a Ultra-ATA channel. (On the P2 400 I've been
running in PIO mode, as that _seems_ to reduce the frequency of the hangs.
On the AMD it seems to make no difference.)
I've seen it too, with a 4.5 system with a maxtor drive. Unfortunately,
I've never been able to track it down to anything certain: I was (and
still am) leaning towards poor hardware over an OS fault. The only thing
leading me to believe it's NOT a hardware issue is that the kernel seems
to be running, although nothing responds: network activity lights flash on
the NIC and switch, but NOTHING else works (have to powercycle).
I remember someone else pointing out the same problem about a year ago,
and nobody ever offered any explanation of the problem or even hinted at a
solution.
The last thread is here (watch the line wrap):
http://docs.freebsd.org/cgi/getmsg.cgi?fetch=6504+0+archive/2002/freebsd-hackers/20020512.freebsd-hackers
- Jeff
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