Ref: 16530006
Title: Setting Up and Using Tape Drives Correctly
Date: 12/31/90

Copyright 3Com Corporation, 1991.  All rights reserved.

In your 3Com dedicated server, you will have either a Tandberg
or an Archive tape drive.  Make sure you know which type of
drive is in your server.  The Tandberg unit has a door that
must be opened to put the tape in the drive.  The Archive unit
has no door; you push a switch to lock the tape in place.
(If the drive is out of the server, you can distinguish
between the two by checking the back of the drive or the side
for the manufacturer name.)

The rest of this article discusses appropriate SCSI address
jumper settings for various configurations of tapes drives and
servers, plugging in the SCSI cable, and using the correct tape
for the tape drive.


SCSI Address Jumper Settings for Tandberg Drives

3S/201

When looking at the drive from the back, the three pins to the
right should be jumpered.  These pins are labeled "Drive Select
2, 1, 0" respectively, from left to right.  Also, three resistors
should be inside the tape unit at the back.  Another way to
confirm that the SCSI address is correct is to look at the drive
from the back, flip it over and read the controller card, which should
say either BIRD, Pari, SEL2, SEL1, or SEL0.

3S/401

To confirm that the SCSI address is correct, look at the drive from
the back, flip it over and read the controller card, which should say
either BIRD, Pari, SEL2, SEL1, or SEL0.  These letters are directly
under the jumper settings at the back of the tape unit.  For a 3S/401
server, there should be only one jumper on the Pari setting.  Or, you
can check the jumper settings on the back under the drive select diagram.

On a 3S/401, take out the three resistors located at the top of the
drive, parallel to the back of the drive.


SCSI Address Jumper Settings for Archive Drives

3S/201

When looking at the drive from the back, on the left side there
are six columns with three rows each of pins for jumpering.  The
settings for a 3S/201 look like this:

      1 2 3 4 5 6
 1    - - X=X X=X
 2    - - - - X=X
 3    - - X=X X=X
      /\  /\  /\
      |    |  |
      |    ----------------- These four columns are for SCSI ID.
      |
      |
These first two columns are for parity.

For the SCSI ID, jumpers are on:

jumper 1  location 1-3 & 1-4
        jumper 2  location 3-3 & 3-4
        jumper 3  location 1-5 & 1-6
        jumper 4  location 3-5 & 3-6

No jumpers are on the first two columns.

This is SCSI address 7.  The default SCSI address of a tape drive
on a 3S/201 is 7.


3S/401

When looking at the drive from the back, on the left side there
are 6 columns with three rows each of pins for jumpering.  The
settings for a 3S/401 look like this:

      1 2 3 4 5 6
 1    - - X=X - -
 2    - - - - - -
 3    X=X X=X - -
      /\  /\  /\
      |    |  |
      |    ----------------- These four columns are for SCSI ID.
      |
      |
These first two columns are for parity.

There is one jumper in the first two columns:

jumper 1  location 3-1 & 3-2

For the SCSI ID, jumpers are on:

jumper 1  location 1-3 & 1-4
        jumper 2  location 3-3 & 3-4

This is SCSI address 0.  The default SCSI address of a tape
drive on a 3S/401 is 0.


SCSI Cable for Tandberg and Archive Tape Drives

Make sure that the side of the cable with the colored marking is
plugged into pin number one, both on the motherboard and on the
drive.

A number one pin on a board usually is distinguished by a square
soldering mark rather than the typical round one.


Using the Correct Tape

Operation as a 150 MB drive is the default for both servers.

150 MB:  To use the tape drive as a 150 MB tape drive on a 3S/401
         and a 3S/202, you must use the 3M brand DC-600 XTD tape
         cartridge.  This is the only supported tape cartridge for
         this mode.

120 MB:  To use the tape drive as a 120 MB drive, you may use the
         3M brand DC-600A or the DEI brand Series II Gold.  In
         addition, you must modify the CONFIG.SYS file of the server
         to add the /120 option to the DEVICE= statement:

                  DEVICE=\3drivers\tape.sys /120

60 MB:   Only the DEI 600L tape is approved for a 60 MB drive.

