pre15 woes w. both 68pin & 50pin
Karl O. Pinc
kop at meme.com
Tue Oct 6 09:24:36 PDT 1998
2.0.35 kernel w. pre-15 patch (& redhat patches)
Micronics W6LI motherboard w. built in aic7880u & adaptec bios 1.24
(dual PPro, but running w/o SMP -- which I suspect fails)
4 Seagate ST-15230W hard drives (68 pin)
(and, in the following physical order)
Yahama 4260t series CDRW (50 pin), internal
Python Dat tape drive (scsi II), external
HP scanner detected as a C2520A (w. 1 centronics & 1 ugly 25pin D connector)
Epson zip drive, external (Iomega licensed knock off w. 25pin D
connectors & internal termination on)
If I disconnect the 50 pin cable and use only the 68 pin w. the disk
drives and bios termination both hi and low, everthing works well. No
scsi timouts & resets. I did get one "(scsi0:0:0:0) Parity error
during Data-In phase."
I carefully re-ran all the ribbon cables so there are _no_ kinks,
everything's smooth and flow-ey like a Henry Moore sculpture.
I tried connecting all the external 50 pin devices and got lots of
scsi disconnects. Booting with "aic7xxx=override_term:0x2" reduced
the problem to where it happens only under load. (FWIW, The bios
dosen't have an "automatic" option.) After forcing termination, I got
2 timeouts under load, and a good dozen "Parity error during Data-In
phase." (I dont' recall seeing many of these before) and one
"resstting for seond half of retries." I also got a good 40 "08:01 :
rw=0 wait=747850753, limit=164848" messages, with various "wait="
numbers of similar magnatude. This happened after the first scsi
timeout and reset. /dev/sdb is the zip drive, the system was booted
w/o a disk in the drive (it assumed a 1GB capacity), and I never did
put a disk in.
Here is the text of some of the messages:
scsi : aborting command due to timeout
SCSI host 0 abort timed out - resetting
SCSI bus is being reset for host 0 channel 0
(Then it reports the sync transfer rate of 20Mbps for the hard drives. good)
attempt to access beyond end of device
08:01 : rw=0 wait=747850753, limit=164848
(scsi0:0:0:0) Parity error during Data-In phase.
scsi0 channel 0: resetting for second half of retries.
SCSI bus is being reset for host 0 channel 0.
Again, all of these messages happened while the machine was under
load, mostly reads.
FWIW, scsi0:0:0:0 has the swap device with the lowest priority.
As usual, I'd be happy to supply further information. I also welcome
any suggestions that might get my system working! Is it just a bad idea to try
to get all these devices on the same bus? I wouldn't mind putting the
scanner and zip drive on a new cheap scsi card, but would like to keep the
Karl <kop at meme.com>
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