pre15 woes w. both 68pin & 50pin

[Andy Kennedy]

I still am unable to run all my drives at 20MB for I have some SLOW
devices on the card.  Even if I set those to run slow and the others fast,
I get all kind of time-outs.  You might try to set them all to the slow
speed. :(  Bytes (he heee) the big one, but works well under full load for
me!

wuff,
andy

On Tue, 6 Oct 1998, Karl O. Pinc wrote:

> 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
> others.
> 
> Karl <kop at meme.com>
> 
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