external scsi disk

From: Oyanarte Portilho <portilho_at_fis.unb.br>
Date: Thu, 11 Nov 1999 12:10:08 -0200

Hi Gurus,

We bought a IBM Ultrastar 18ES 18.1Gb external disk and would like to
install it in a DEC AXP 3000 600M box (the seller Western Scientific claims
it fits the box), running DU 3.2. Attached to the scsi cpu connector is
a column with six 2Gb disks and a DAT tape unit, occupying the scsi
numbers 8, 9,..., 14. There are also two internal disks with numbers 2
and 3; CD-ROM unit is number 4:

 scsi0 at tcds0 slot 0
 rz2 at scsi0 bus 0 target 2 lun 0 (DEC _ RZ28B (C) DEC 0003)
 rz3 at scsi0 bus 0 target 3 lun 0 (DEC _ RZ28B (C) DEC 0003)
 rz4 at scsi0 bus 0 target 4 lun 0 (DEC _ RRD43 (C) DEC 0064)
 scsi1 at tcds0 slot 1
 rz8 at scsi1 bus 1 target 0 lun 0 (DEC _ RZ28 (C) DEC D41C)
 rz9 at scsi1 bus 1 target 1 lun 0 (DEC _ RZ28 (C) DEC D41C)
 rz10 at scsi1 bus 1 target 2 lun 0 _(DEC RZ28 (C) DEC D41C)
 rz11 at scsi1 bus 1 target 3 lun 0 _(DEC RZ28 (C) DEC D41C)
 rz12 at scsi1 bus 1 target 4 lun 0 _(DEC RZ28 (C) DEC D41C)
 rz13 at scsi1 bus 1 target 5 lun 0 _(DEC RZ28B (C) DEC 0003)
 tz14 at scsi1 bus 1 target 6 lun 0 _(DEC TLZ06 (C)DEC 0491)

We have connected the disk to the empty connector in the column with a 68
pin cable. We tried to identify the disk as scsi number 15 and followed the
steps:

1) cd /dev
   ./MAKEDEV rz15

2) Added the line to /etc/disktab

   rz30:\
        :ty=dynamic_geometry:dt=SCSI:ns#-1:nt#-1:nc#-1:

3) By giving the command

   disklabel -rw /dev/rrz15c rz30

   we get a error message:

   disklabel: /dev/rrz15c: No such device or address

Then we tried the scsi number 7 but to no avail. We have tried those
steps both using and not using a terminator in the external disk box.
When turning on the station, one of the disk leds blinks; so it is
not completely unseen. However it is not detected in the LSM prompt with
show device or during boot. Any hints on what is wrong and how to install
such a ultra scsi disk? Maybe the /etc/disktab entry is not appropriate.
Suggestions?

TIA,

        Oyanarte Portilho
        Institute of Physics
        University of Brasilia, Brazil
Received on Thu Nov 11 1999 - 14:11:39 NZDT

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