Date: Sun, 3 Nov 2002 11:50:09 -0600 From: Jason Godfrey <godfrey@sol.aptsolutions.com> To: Jeff Jirsa <jeff@unixconsults.com> Cc: freebsd-questions@FreeBSD.ORG, freebsd-hackers@FreeBSD.ORG Subject: Re: Disk activity leading to hangs Message-ID: <20021103115009.C43728@sol.aptsolutions.com> In-Reply-To: <20021102220616.S7015-100000@boris.st.hmc.edu>; from jeff@unixconsults.com on Sat, Nov 02, 2002 at 10:12:09PM -0800 References: <20021102235447.D35685@sol.aptsolutions.com> <20021102220616.S7015-100000@boris.st.hmc.edu>
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(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 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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