Re: SCSI question (KZPEA-CX adaptor)
- From: gartmann@xxxxxxxxxxxxxxxxxxxxxxxx (Christoph Gartmann)
- Date: Thu, 2 Apr 2009 07:57:59 +0000 (UTC)
In article <001c5c77$0$19603$c3e8da3@xxxxxxxxxxxxxxxxx>, JF Mezei <jfmezei.spamnot@xxxxxxxxxxxxx> writes:
I finally installed a KZPEA-CX adaptor on a DS10L.[...]
I had some adaptor that fitted onto the external plug of the KZPEA-CX
and provided a standard 50 pin ribbon cable interface.
Plugged in a CD drive (old Sony drive very similar to the RRD42). The
SRM console would see the drive, get its identity, generate a DKA400:
device. But couldn't boot from it.
dka400.4.0.17.0 DKA400 SONY CD-ROM CDU-8003A 1.8fshow dev
So it detects that this old SCSI drive is a narrow ("no" to "Negotiate
Wide") and that it doesn't suport tagged queuing.
However, trying to do a "Verify media" results in it telling me it isn't
a disk device.
However, booting into VMS:
$ show dev $10$dka400:/full
Disk $10$DKA400: (BIKE), device type SONY CD-ROM CDU-8003A, is online, file-
oriented device, shareable, served to cluster via MSCP Server, error logging
is enabled.
Error count 0 Operations completed 0
Owner process "" Owner UIC [SYSTEM]
Owner process ID 00000000 Dev Prot S:RWPL,O:RWPL,G:R,W
Reference count 0 Default buffer size 512
Allocation class 10
But:
$ mount/nowrite/override=id $10$dka400: test
%MOUNT-F-MEDOFL, medium is offline
I Have tried this with different setups, including plugging the 50 pin
ribbon cable directly into the KZPEA card's internal 50 pin connector.
QUESTIONS:
If the controller is able to find out the identity of this device,
notice it isn't wide etc:
-does this mean that the connection (cable, adaptor etc) is fully
functional?
No, this means that there is some data exchange between the CD-ROM and the
host and hence, there must be some sort of connection.
or are there primitive exchanges (such as getting
information from device) which can be done with a deffective connection
but when you try to do real access to the device , it fails ?
This is pretty common.
-the card is set to have auto termination. Would an unterminated CD
ROM drive at the other end of the cable cause this behaviour ? I'd have
to search for the specs of this drive to see if it is terminated or not.
Termination is important. I wouldn't rely on auto-termination. The last device
on the bus has to be terminated. Thus, enable termination on the drive and
disable auto-termination on the card.
Regards,
Christoph Gartmann
--
Max-Planck-Institut fuer Phone : +49-761-5108-464 Fax: -80464
Immunbiologie
Postfach 1169 Internet: gartmann@immunbio dot mpg dot de
D-79011 Freiburg, Germany
http://www.immunbio.mpg.de/home/menue.html
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