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From: jeb@gamma.UUCP
Newsgroups: comp.unix.questions,comp.unix.wizards
Subject: trouble with multi tape controllers under ULTRIX
Message-ID: <372@gamma.UUCP>
Date: Tue, 14-Apr-87 07:49:09 EST
Article-I.D.: gamma.372
Posted: Tue Apr 14 07:49:09 1987
Date-Received: Fri, 17-Apr-87 05:15:17 EST
Organization: Bellcore, Livingston, NJ
Lines: 56
Keywords: HELP!!!
Xref: utgpu comp.unix.questions:1723 comp.unix.wizards:1780


We have a VAX 8650 running ULTRIX. There are 4 TU78 tape units attached.
There are 2 master and 2 slave units. They are cabled as follows:
Unit 0 has a controller cabled as slave 0 to its controller
Unit 1 is a slave cabled to controller on unit 0 as slave 1
Unit 2 has a controller cabled as slave 2 to its controller
Unit 3 is a slave cabled to controller on unit 2 as slave 3

The first question, are they cabled correctly?

The following is the entries in the configuration file for the tape units:

controller      mba0  at  nexus  ?
master          mt0  at   mba?  drive ?
tape            mu0  at    mt0  slave 0
tape            mu1  at    mt0  slave 1
master          mt1  at   mba?  drive ?
tape            mu2  at    mt1  slave 2
tape            mu3  at    mt1  slave 3

Second question, is this configuration correct?

The following is the output for the mba from the boot of the system.

mba0 at address 0x22014000
mt0 at mba0 drive 0
mu0 at mt0 slave 0
mu1 at mt0 slave 1
mt1 at mba0 drive 1
mu2 at mt1 slave 2
mu3 at mt1 slave 3

The problem we are having is that we can't get to the units on the second
controller (mt1). Here are the following devices in the /dev directory
assigned to the tape units:

crw-rw-rw-  1 root      19,   0 Mar 27 06:48 /dev/rmt0
crw-rw-rw-  1 root      19,   1 Mar 27 06:48 /dev/rmt1
crw-rw-rw-  1 root      19,   2 Apr 13 20:52 /dev/rmt2
crw-rw-rw-  1 root      19,   3 Mar 27 06:56 /dev/rmt3
crw-rw-rw-  1 root      19,   4 Mar 27 06:48 /dev/rmt4
crw-rw-rw-  1 root      19,   5 Mar 27 06:48 /dev/rmt5
crw-rw-rw-  1 root      19,   6 Mar 27 06:49 /dev/rmt6
crw-rw-rw-  1 root      19,   7 Mar 27 06:49 /dev/rmt7
crw-rw-rw-  1 root      19,   8 Apr 13 22:02 /dev/rmt8
crw-rw-rw-  1 root      19,   9 Apr 13 20:45 /dev/rmt9
crw-rw-rw-  1 root      19,  10 Apr 13 20:47 /dev/rmt10
crw-rw-rw-  1 root      19,  11 Apr 13 20:47 /dev/rmt11
crw-rw-rw-  1 root      19,  12 Mar 27 06:48 /dev/rmt12
crw-rw-rw-  1 root      19,  13 Mar 27 06:48 /dev/rmt13
crw-rw-rw-  1 root      19,  14 Mar 27 06:49 /dev/rmt14
crw-rw-rw-  1 root      19,  15 Mar 27 06:49 /dev/rmt15

Is there anyone out in netnews land who is doing something similar?

Also, is more than one tape controller supported by ULTRIX?