Date: Fri, 3 Apr 1998 02:16:40 -0800 (PST) From: "Bryan K. Ogawa" <bkogawa@primenet.com> To: Malte Lance <malte@webmore.com> Cc: questions@FreeBSD.ORG Subject: Re: Advice for diagnosing X hangs / kernel hangs? Message-ID: <Pine.BSI.3.94.980403021334.5256A-100000@foo.primenet.com> In-Reply-To: <3.0.32.19980403094213.006d37ac@cyclone.degnet.baynet.de>
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On Fri, 3 Apr 1998, Malte Lance wrote:
> At 13:42 02.04.98 -0800, you wrote:
> >On Mon, 30 Mar 1998, Malte Lance wrote:
> >> At 23:22 29.03.98 -0800, you wrote:
> >> >On Tue, 24 Mar 1998, Bryan K. Ogawa wrote:
> Maybe ... i encounter similar problems where my machine suddenly freezes
> (no log, no error, no nothing ... just sudden-death).
> I noticed it must be something with the scsi-system (while listening to
> the old good 'Ludwig van' ;)
> I changed the terminating device from CDROM to the tape-drive (SONY SDT-7000).
> Then this freezes did not happen as often as they did when the CDROM was
> terminating my scsi-bus.
> I suspect TERM-POWER is causing this trouble but i am not sure.
> I have played with the term-power config a little:
> 1. no term-power (same as no active terminator) [bad idea]
> 2. term-power connected just to the terminator, not the scsi-bus [good idea]
> 3. term-power connected to the terminator AND the scsi-bus [not so good]
> Best results gave nr. 2. so far (waiting for the next freeze with this
> config).
> My freezes always occur on heavy concurrent diskaccess.
> My scsi-system: controller, 3 scsi-disks, cdrom, tape, zip.
> It is not an OS-specific problem since this shit also happens with Win-95.
> On the next freeze i will take a disk as terminating device.
> If this will not solve my problems, i will order a new scsi-controller and
> forget about my adaptec-2940.
> Maybe you want to play with your scsi-bus-termination. Let me know about
> your results.
Hm... I agree with you -- this may be a SCSI problem (see the comments in
-stable about SCSI stuff).
I now have a 2nd machine so I can try to telnet when next my system hangs.
I have also had great success in reducing my hangs by running the
following program from another virtual console:
#include <stdio.h>
#include <unistd.h>
int main (void)
{
for(;;) {
sync();
sleep(12);
}
}
This does a sync() every 12 seconds. I leave it running and I haven't had
a hang since (there was one, but I think I had suspended the
syncer before that hang).
bryan k ogawa <bkogawa@primenet.com> http://www.primenet.com/~bkogawa/
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