Date: Fri, 3 Apr 1998 12:30:42 -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.3.94.980403122410.3921A-100000@foo.primenet.com> In-Reply-To: <3.0.32.19980403113026.007430fc@cyclone.degnet.baynet.de>
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[ question about On Fri, 3 Apr 1998, Malte Lance wrote: > At 02:16 03.04.98 -0800, you wrote: > >On Fri, 3 Apr 1998, Malte Lance wrote: > >> 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. > > > >> 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). > > ??? "-stable" ? What do you mean ??? BTW: -stable stands for the mailing list freebsd-stable@freebsd.org . I recommend it if you are running anything in 2.2 , especially if you run anything between releases. Since this may be a SCSI problem, I'll probably send a quick note to freebsd-scsi as well. > >I now have a 2nd machine so I can try to telnet when next my system hangs. > > > > No use. Done it already. As i said. When my machine freezes, it is like > shock-frozen, nothing works. Not even a ping comes back when pinging > it. Therefor I dont believe you will be able to telnet into it. Yeah, my system just hung while running the program I supplied and it was unpingable. However, this isn't the symptom that I had heard of previously in the -stable list for SCSI bugs. It may be termination, however. > >I have also had great success in reducing my hangs by running the > >following program from another virtual console: > > This is fighting the symptoms ... no real solution. But for the time, until > a solution is found, it is undoubtly useful. Yes, and if we can find a way to reliably prevent the hangs from software, then it may help in diagnosing the cause. bryan k ogawa <bkogawa@primenet.com> http://www.primenet.com/~bkogawa/ To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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