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From: ue@nathan.ruhr.de (Udo Erdelhoff)
Newsgroups: comp.unix.bsd.freebsd.misc
Subject: Re: Need help adding SCSI tape drive
Date: 20 Dec 1996 15:46:21 +0100
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Message-ID: <59e8rt$3tv@nathan.ruhr.de>
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Charlie Sorsby (crs@lanl.gov) wrote:
[Archive 2150S doesn't work]
: I have only two weeks to decide if the drive is OK and the clock
: began yesterday...
Don't panic...
: I can't see the jumpers for the disk-drive but according to the
: 2940 scsi utilities, it is SCSI ID 0.
The jumpers are hidden under the drive. You'll have to remove the
drive from your system to check them.
: The CDROM drive is jumpered for SCSI ID 1.
: The tape drive came jumpered for SCSI ID 4 and I left it that way.
: The 2940 scsi utilities (I guess it's actually the Adaptec scsi
: utilities) see only the disk drive, the CDROM drive, and the host
: adapter (SCSI ID 7).
Do you mean that the 2940 does not find the tape when it scans the
scsi bus after power-up? If this is true, you have a SCSI problem,
not a FreeBSD problem. There are several possible reasons:
a) termination
b) SCSI cable
c) power connector
d) ID collision
e) drive
Start by checking the termination. The termination on the IBM
is controlled by one of the jumpers. Remove the drive from your
system and turn it upside down. It should look like this:
+-------------------------------
Power |
Connector |-------------+
| |
| electronics |
| | JP1
| |=
| |= <---- Jumper Block
SCSI I/F | |=
Connector | |=
|-------------+ JP12
|
+------------------------------------
The important jumpers are:
JP2: SCSI ID Bit 2
JP3: SCSI ID Bit 1
JP4: SCSI ID Bit 0
JP6: Terminator ON
(More information can be found on the web pages of IBM's storage
systems division)
If the IBM is at the end of the SCSI cable, JP6 must be set. If the
IBM is somewhere in the middle of the cable, JP6 must not be set.
If the termination is correct (don't forget the 2940!), remove the
CD-ROM and the tape from your system. Check if the disk drive works
on all the SCSI connectors. If you have a really long cable, you
should leave the IBM (with activated terminator) at one end, the
2940 at the other end and use your CD-ROM to check the connectors.
The power connectors should be easy to check.
Remove disk and CD-ROM from your system and use only the 2940 and
the tape drive. Check if pin 1 is oriented correctly. Use the IBM as
terminator if you cannot terminate the tape. If your tape drive
still doesn't appear, change the SCSI id of the 2940 from 7 to
6 (and the SCSI ID of the IBM from 0 to 1 if you had to use it
as terminator).
If the 2940 still can't find the tape drive, you should return it.
/s/Udo
--
Udo Erdelhoff ue@nathan.ruhr.de