[2858] in linux-scsi channel archive
Re: Problems w/ CD-Rom XM-5701 and AHA-2940UW
daemon@ATHENA.MIT.EDU (Roger Zimmermann)
Mon Nov 24 12:43:40 1997
To: linux-scsi@vger.rutgers.edu
cc: deischen@iworks.InterWorks.org
From: "Roger Zimmermann" <Zimmermann@fvk-berlin.de>
Date: Mon, 24 Nov 1997 18:36:57 +0100
Hi Daniel,
thanks for Your reply.
It took a bit of time to answer, sorry. We are just preparing some scientific
project which is - as usual - quite urgent.
Concerning the SCSI problem:
>Don't use auto-termination if you have problems. You can
>boot in verbose mode to see what the driver is doing with
>auto-termination (boot: aic7xxx=verbose).
>If you are using the CD-ROM drive to terminate the bus,
>don't. Use active termination; try using one of your
>disk drives to terminate the bus.
Now, this is spit out w/ the verbose mode of the aic7xxx driver w/ the:
A) original hardware cable connections:
(CD-rom is the last device connected to the cable)
...
aic7xxx: <Adaptec AHA-294X Ultra SCSI host adapter> at PCI 12
aic7xxx: Loading serial EEPROM...done
aic7xxx: Warning - detected auto-termination. Please verify driver
detected settings and use manual termination if necessary.
aic7xxx: Cables present (Int-50 YES, Int-68 NO, Ext-68 NO)
aic7xxx: eprom is present, brdctl_int=0xac, brdctl_ext=0xec
aic7xxx: Termination (Low ON, High ON)
aic7xxx: BIOS enabled, IO Port 0xe000, IO Mem 0xfa000000, IRQ 12, Revision B
aic7xxx: Extended translation enabled.
aic7xxx: Wide Channel, SCSI ID 7, 16/255 SCBs, QFull 16, QMask 0x1f
aic7xxx: Resetting channel A
aic7xxx: Downloading sequencer code... 414 instructions downloaded
scsi0 : Adaptec AHA274x/284x/294x (EISA/VLB/PCI-Fast SCSI) 4.1/3.2
scsi : 1 host.
...
B) with the CD-Rom connected as the first device in the cable and a HD as the
last one:
...
aic7xxx: <Adaptec AHA-294X Ultra SCSI host adapter> at PCI 12
aic7xxx: Loading serial EEPROM...done
aic7xxx: Warning - detected auto-termination. Please verify driver
detected settings and use manual termination if necessary.
aic7xxx: Cables present (Int-50 YES, Int-68 NO, Ext-68 NO)
aic7xxx: eprom is present, brdctl_int=0xac, brdctl_ext=0xec
aic7xxx: Termination (Low ON, High ON)
aic7xxx: BIOS enabled, IO Port 0xe000, IO Mem 0xfa000000, IRQ 12, Revision B
aic7xxx: Extended translation enabled.
aic7xxx: Wide Channel, SCSI ID 7, 16/255 SCBs, QFull 16, QMask 0x1f
aic7xxx: Resetting channel A
aic7xxx: Downloading sequencer code... 414 instructions downloaded
scsi0 : Adaptec AHA274x/284x/294x (EISA/VLB/PCI-Fast SCSI) 4.1/3.2
scsi : 1 host.
...
===> seems to be the same.
In my previous mail I mentioned shortly that we have two computer w/ little
differing hardware. One has the CD-rom and two 4.3GB Quantuum Harddisks, the
other has an additional Seagate 1GB disk and a Yamaha 400t CD-writer device w/
external cable. The problem with the CD-roms are the same on both computers.
>I think that with 8 commands/target, you can get Queue_Full
>conditions out of these (narrow) Quantum drives. You may
>want to lower your commands/lun to something lower than 8.
>Will someone else familiar with these Fireballs please
>comment on what the queue depth should be?
Maybe, but:
The Toshiba CD-roms are the only devices which caused problems under the
described special circumstances (`dd` and `mount` commands). All other disks
never caused noticable problems. I *can* execute exactly the same commands
successfully simply by using the Yamahe 400t device instead of the Toshiba
cd-rom device. And this happens independently of the two cable settings.
Therefore I thought that the problem is related to the Toshiba CD-rom ...
Cheers, Roger
--
Roger Zimmermann *** Elektro- und Magnetophysiologie, Berlin Buch
Wiltbergstra/3e 50 D - 13125 Berlin Tel.: <Ger>/30 9417 2427
----------------------------------------- Fax.: <Ger>/30 9417 2466
via E-mail: zimmermann@fvk-berlin.de /// roz@berlin.snafu.de
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