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SubjectRe: SCSI timeouts AHA2940U
Just a possible reason...We have had overheating problems in a lot of our
servers and we had a time once where somebody decided to "clean up" the
server room by taking off all of the ugly fans off of the servers
(*cough*)...after a few minutes, the mail server started giving SCSI bus
timeouts and resets. Adaptec 2940UW w/Quantum viking (4.3GB?) drives.
After the fan was put back, everything was fine.

Perhaps try a fan on the drives or something similar.

Simon-

| Simon Kirby | Systems Administration |
| mailto:sim@netnation.com | NetNation Communications |
| http://www.netnation.com/ | Tech: (604) 684-6892 |
--
On Sat, 12 Sep 1998, Rolf Fokkens wrote:

> Until recently I believed my system was a stable system. I had no
> problems at all. But then I did this:
>
> vrec -w -t 260 -s 44100 -S -b 16 | cat | cat | cat | cat > test.wav
>
>
> Meaning recording from the sound device at 44 kHz, stereo, 16 bits for
> 260 seconds.
>
> The first time this was successfull, and the second time it was too. But
> the third time it resulted in SCSI timeouts:
>
> Aug 23 15:40:20 home01 kernel: scsi : aborting command due to timeout :
> pid 5162
> 1, scsi0, channel 0, id 6, lun 0 UNKNOWN(0x42) 02 40 01 00 00 00 00 10
> 00
> Aug 23 15:40:20 home01 kernel: SCSI host 0 channel 0 reset (pid 51618)
> timed out
> - trying harder
> Aug 23 15:40:20 home01 kernel: SCSI bus is being reset for host 0
> channel 0.
> Aug 23 15:40:20 home01 kernel: SCSI host 0 abort (pid 51619) timed out -
> resetti
> ng
> Aug 23 15:40:20 home01 kernel: SCSI bus is being reset for host 0
> channel 0.
> Aug 23 15:40:31 home01 kernel: Sound: Recording overrun
> Aug 23 15:40:38 home01 last message repeated 311 times
> Aug 23 15:41:13 home01 kernel: nd: Recording overrun
> Aug 23 15:41:13 home01 kernel: Sound: Recording overrun
> Aug 23 15:41:13 home01 last message repeated 63 times
> Aug 23 15:41:13 home01 kernel: SCSI host 0 abort (pid 51752) timed out -
> resetti
> ng
> Aug 23 15:41:13 home01 kernel: SCSI bus is being reset for host 0
> channel 0.
> Aug 23 15:41:13 home01 kernel: Sound: Recording overrun
> Aug 23 15:41:13 home01 last message repeated 21 times
> Aug 23 15:41:13 home01 kernel: SCSI host 0 channel 0 reset (pid 51752)
> timed out
> - trying harder
> Aug 23 15:41:13 home01 kernel: SCSI bus is being reset for host 0
> channel 0.
>
> Since then I experimented with it, and it appears that that I can
> reproduce this behaviour sometimes after calling the vrec thing once,
> but allways after calling it three times.
>
> I sent a message to this maillist assuming it had to do with my recently
> installed second CPU. It appeared however that this didn't have anything
> to do with it.
>
> Most replies I received assured my that lots of people never had trouble
> with their aha2940 at all.
>
> Well, to be honest: untill I tried the vrec thing I never had any
> trouble too. And as long as I don't use it my system is stable like all
> the other stable ones. I wonder however if other people consider their
> system stable after they try the vrec thing. If they still consider
> their system stable afterwards it must some kind of hardware problem in
> my PC, otherwise it might be a driver problem.
>
> More details about my system:
>
> DEC PC5500 dual PII
> 64MB memory
> 4GB IBM DCAS, 2 GB IBM DORS
> on-board ES1887 sound chip
> TELES isdn adapter (Hisax driver)
> Ultraplex 32x SCSI CD-ROM
>
> What I tried:
>
> Non-ultra SCSI disk (seagate): There appeared to be no problem at all!
> AHA2940UW: same problem
> Disconnected CD-ROM: same problem
> Removed 1 CPU: same problem
> Instructed Adaptec BIOS to use lowest transfer rates: same problem
> used shorter SCSI cable: same problem
> disable automatic termination: same problem
> copied 64mb swap file to another location: same problem sometimes
> copied 4 x 640 MB (4CD-s) to non-ultra SCSI disk: no problem at all.
>
> This problem seems to be ultra-scsi related, combined with sound.
>
> Who's willing to stress-test his system the same way? The first attemts
> may not result in problems, so retry this a few times.
>
> Rolf Fokkens


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