Black Box SW847A User manual

1000 Park Drive • Lawrence, PA 15055-1018 • 724-746-5500 • Fax [phone]
© Copyright 1995. Black Box Corporation. All rights reserved.

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SUPPORT
INFORMATION
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Mailing address: Black Box Corporation, 1000 Park Drive, Lawrence, PA 15055-1018
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DECEMBER 1995
SW847A
SW848A
SCSI Switch (for AS/400®)
SCSI
Switch
(for AS/400 )
®
HOST A
ACTIVE
SWITCH
READY
HOST B
ACTIVE
HOST A
ACTIVE
SWITCH
READY
HOST B
ACTIVE
HOST A
AUTO
HOST B
HOST A
AUTO
HOST B

3
INSTRUCCIONES DE SEGURIDAD
NORMAS OFICIALES MEXICANAS (NOM)
ELECTRICAL SAFETY STATEMENT
INSTRUCCIONES DE SEGURIDAD
1. Todas las instrucciones de seguridad y operación deberán ser leídas antes
de que el aparato eléctrico sea operado.
2. Las instrucciones de seguridad y operación deberán ser guardadas para
referencia futura.
3. Todas las advertencias en el aparato eléctrico y en sus instrucciones de
operación deben ser respetadas.
4. Todas las instrucciones de operación y uso deben ser seguidas.
5. El aparato eléctrico no deberá ser usado cerca del agua—por ejemplo,
cerca de la tina de baño, lavabo, sótano mojado o cerca de una alberca,
etc..
6. El aparato eléctrico debe ser usado únicamente con carritos o pedestales
que sean recomendados por el fabricante.
7. El aparato eléctrico debe ser montado a la pared o al techo sólo como
sea recomendado por el fabricante.
8. Servicio—El usuario no debe intentar dar servicio al equipo eléctrico más
allá a lo descrito en las instrucciones de operación. Todo otro servicio
deberá ser referido a personal de servicio calificado.
9. El aparato eléctrico debe ser situado de tal manera que su posición no
interfiera su uso. La colocación del aparato eléctrico sobre una cama,
sofá, alfombra o superficie similar puede bloquea la ventilación, no se
debe colocar en libreros o gabinetes que impidan el flujo de aire por los
orificios de ventilación.
10. El equipo eléctrico deber ser situado fuera del alcance de fuentes de
calor como radiadores, registros de calor, estufas u otros aparatos
(incluyendo amplificadores) que producen calor.

4
INSTRUCCIONES DE SEGURIDAD
11. El aparato eléctrico deberá ser connectado a una fuente de poder sólo
del tipo descrito en el instructivo de operación, o como se indique en el
aparato.
12. Precaución debe ser tomada de tal manera que la tierra fisica y la
polarización del equipo no sea eliminada.
13. Los cables de la fuente de poder deben ser guiados de tal manera que no
sean pisados ni pellizcados por objetos colocados sobre o contra ellos,
poniendo particular atención a los contactos y receptáculos donde salen
del aparato.
14. El equipo eléctrico debe ser limpiado únicamente de acuerdo a las
recomendaciones del fabricante.
15. En caso de existir, una antena externa deberá ser localizada lejos de las
lineas de energia.
16. El cable de corriente deberá ser desconectado del cuando el equipo no
sea usado por un largo periodo de tiempo.
17. Cuidado debe ser tomado de tal manera que objectos liquidos no sean
derramados sobre la cubierta u orificios de ventilación.
18. Servicio por personal calificado deberá ser provisto cuando:
A: El cable de poder o el contacto ha sido dañado; u
B: Objectos han caído o líquido ha sido derramado dentro del
aparato; o
C: El aparato ha sido expuesto a la lluvia; o
D: El aparato parece no operar normalmente o muestra un cambio en su
desempeño; o
E: El aparato ha sido tirado o su cubierta ha sido dañada.

5
SCSI SWITCH (FOR AS/400®)
TRADEMARKS
IBM®and AS/400®are registered trademarks of International Business
Machines Corporation.
All applied-for and registered trademarks are the property of their
respective owners.

6
SCSI SWITCH (FOR AS/400®)
CONTENTS
1. Specifications ..................................................................................7
2. Introduction....................................................................................8
3. Installing and Configuring the SCSI Switch (for AS/400®).........9
3.1 Subsystem Requirements........................................................9
3.2 Installing the SCSI Switch into the Rack ...............................10
4. Configuring and Operating the SCSI Switch (for AS/400®.........17
4.1 Configuring the SCSI Switch to the AS/400 .........................17
4.2 Overview of the Front Panel...................................................21
4.3 SCSI Switch Microcode Updates............................................26
5. Troubleshooting .............................................................................29
Appendix: Monitor Guide.................................................................30

7
SCSI SWITCH (FOR AS/400®)
1. Specifications
Compatibility—IPL 6790E and IBM®3490E-EXX Tape Drives
AS/400 Attachment—6501 IOP
Software Requirements—OS/400 Version 2, Release 3 or higher
Mean Time Between Failure (MTBF)—150,000 hr.
Operating Environment—Temperature: 60° to 90° F (15.5° to 32° C);
Relative Humidity: 20 to 80%
Cables Required—SW847A: (1) for connection to tape device (included
with your tape device), (2) for connection to host CPUs (included with the
SCSI Switch); SW848A: (2) for connection to tape device (included with
your tape devices), (4) for connection to host CPUs (included with the
SCSI Switch)
Power—110 to 240 VAC, auto-sensing, 0.16 KVA
Size—Both SW847A and SW848A: 3.3"H x 19"W x 26.3"D (8.3 x 48 x 67 cm)
Weight—Both SW847A and SW848A: 21 lb. (9.5 kg)

8
SCSI SWITCH (FOR AS/400®)
2. Introduction
The SCSI Switch (for AS/400®) is a dynamic fast/wide switching device that
provides intelligent unattended switching of IPL 6790E and IBM 3490E-EXX
1/2" cartridge tape drives between AS/400 hosts.
The SCSI Switch features include:
• Unattended switching support for up to two tape drives and four host
systems
• 100% compatibility with OS/400
• Compact rackmount design
• Industry’s only dynamic switching device for Fast/Wide SCSI tape drives
Cost-Effective CPU Sharing
Through OS/400 commands, the SCSI Switch provides your site with
complete unattended tape-drive sharing between multiple AS/400 hosts.
The SCSI Switch eliminates the added purchase and maintenance costs
needed to support separate 36-track 1/2" cartridge tape drives for each CPU.
Superior Protection
The SCSI Switch features a slim, 2 EIA-unit rackmount design with a control
panel that monitors the host CPU and current backup status. A manual
override switch protects your equipment if your host CPU fails.
Complete Flexibility
The SCSI Switch connects to the AS/400 9404 and 9406 (Models D, E, F), and
all Advanced Series 200 and 300 models. The SCSI Switch is the industry’s
only unattended tape-drive switching device that attaches to IBM’s AS/400
Fast/Wide SCSI 6501 IOP.

9
SCSI SWITCH (FOR AS/400®)
3. Installing and Configuring
the SCSI Switch
3.1 Subsystem Requirements
Before installing the SCSI Switch (for AS/400®) verify that:
• All environmental, power and space requirements have been met.
• All host system interface requirements have been provided. These
requirements can be found in this section. Look under the appropriate
“Host System Requirements” for the system in question.
Environmental Requirements
Temperature—Operating: 60° to 90° F (15.5° to 32° C),
Non-operating: -40° to 122° F (-40° to 50° C)
Humidity (noncondensing)—Operating: 20 to 80%,
Non-operating: 10 to 90%
Power Requirements
The SCSI Switch (for AS/400®) requires a dedicated power receptacle
with an isolated earth ground. Power may also be provided via the
IBM 9039 rack using an accessory cord.
For 120V outlets at 120 VAC, a NEMA 5-15R receptacle is required.
For 220V outlets at 220 VAC, a NEMA 6-15R receptacle is required.
CAUTION
Water pipes or building conduits are not adequate earth-ground
substitutes.
Space Requirements
The SCSI Switch (for AS/400®) can be rack-mounted. It requires
two EIA locations in a 9309 rack.

10
SCSI SWITCH (FOR AS/400®)
Compatible Racks for the SCSI Switch
The SCSI Switch, which is in a self-contained module, should be mounted in
the same rack that your tape drive is mounted in. Usually, you will already
have this rack if you already have a tape drive. If you need to order a rack, the
following are compatible with both the tape drive and the SCSI Switch:
• IBM 9309 System Rack (SC9125)
• IBM 9309 System Unit/9332 Rack (SC9126)
• IBM 9309 I/O Expansion Rack (SC9130)
3.2 Installing the SCSI Switch in the Rack
Unpacking and Packing
The SCSI Switch (for AS/400®) Subsystem is packaged in electrically
conductive containers. Save all packing material in case you need to ship,
store, or move the units later.
After you remove the SCSI Switch from the container, inspect it for
damage. If the equipment is damaged, immediately contact your dealer.
NOTE
Static electricity is generated by common activities such as walking
across a carpet, transporting items in plastic containers, and handling
synthetic materials. Electrostatic discharge (ESD) may result in
degraded reliability or failures.
Tools Required
The only tools you need to support the SCSI Switch can be found in a
standard tool kit:
• a Philips head screwdriver or common screwdriver
• a pair of pliers
• an adjustable wrench

11
SCSI SWITCH (FOR AS/400®)
Inventory of Equipment
Before installing the SCSI Switch, make sure you have the following
components:
• SCSI Switch (for AS/400®)
• SW847A: (2) cables for connecting the Switch to the AS/400 hosts,
SW848A: (4) cables for connecting the Switch to the AS/400 hosts
• Mounting hardware
• This user manual
If any parts are missing, contact your dealer.
Preparing the IBM 9309 Rack
WARNING
Disconnect power before servicing. You might be shocked!
The rack-mounted SCSI Switch requires 2 EIA units of vertical space.
One EIA is equal to 1.75 inches. EIA is the acronym for Electrical Industry
Association. Each EIA has a three-hole pattern for mounting rails. Remove
the rack filler panel from the location the device is to be installed in.
Mounting the SCSI Switch in the Rack
Figure 3-1 shows the EIA layout for installing the Switch in the top of a 9309
rack.
C EIA Unit 32
AX
B X EIA Unit 31
C
A
Figure 3-1. EIA Pattern Layout.

12
SCSI SWITCH (FOR AS/400®)
Follow these steps to install the Switch in a rack:
1. Loosely install a nut plate on both the front and rear rails of the rack in
the lower EIA unit to be used, by putting a 10-32 screw in holes A and B of
the EIA unit.
2. Place the rails in position in the rack and tighten the screws.
3. Extend the rails out of the rack to the locked position.
4. Mate the rails on the SCSI Switch chassis to the extended rails, depress
the safety latches on the rails, and push the Switch fully into the rack.

Cables Required
(For one or two tape drives and two AS/400 hosts)
Table 3-1. Terminator and Cables Required.
Item Description Quantity
SW847A SW848A
Built into unit
or included Feed-Thru Terminator 1 1
Included External wide SCSI cable 2 4
Included 2 m Standard SCSI cable 1 2
Figure 3-2. Cabling the SCSI Switch.
I0
HOST A HOST B TAPE
SERVICE PORT
12
To 6501
Cable
included
To 6501
Cable
included
To 6501
Cable
included
To 6501
Cable
included
To 6790E/3490E
Cable included
with tape drive
To 6790E/3490E
Cable included
with tape drive
13
SCSI SWITCH (FOR AS/400®)

14
SCSI SWITCH (FOR AS/400®)
To configure either tape drive on SW2, follow the cabling instructions listed
above, but attach the cables to the top row of connectors.
Figure 3-3. Two AS/400 Hosts, One IPL 6790E.
IPL
6790E
FEED THRU
TERMINATOR
HOST A
HOST B
TAPE
SCSI SWITCH for AS/400®
Cable supplied with
tape drive
Cables supplied
with Switch

15
SCSI SWITCH (FOR AS/400®)
Figure 3-4. Two AS/400 Hosts, One IBM 3490E.
To configure either tape drive on SW2, follow the cabling instructions
listed above, but attach the cables to the top row of connectors.
NOTE
Replace the existing cable between the tape drive and the IOP
and replace it with the cable supplied with the switch.
With tape drives mounted side by side, the lower connectors will control
the tape drive on the left; the upper connectors will control the tape drive
on the right.
HOST A
HOST B
TAPE
SCSI SWITCH for AS/400®
IBM CABLE
IBM
3490E
TERMINATOR
TO TAPE
DRIVE
NOTE: REMOVE INTERPOSER
Cables supplied
with the Switch
(Supplied with
the tape drive)

16
SCSI SWITCH (FOR AS/400®)
In a maximum configuration, the SCSI Switch (SW848A) supports
unattended switching for two tape drives and four AS/400 hosts.
Figure 3–5. SCSI Switch (SW848A), Maximum Configuration.
Tape DriveTape Drive
AS/400 9406 AS/400 9406 AS/400 Advanced SeriesAS/400 9404

17
SCSI SWITCH (FOR AS/400®)
4. Configuring and Operating
the SCSI Switch
4.1 Configuring the SCSI Switch to the AS/400
The following procedures must be performed on one AS/400 at a time.
When configuring the drives and the SCSI Switch to the second AS/400,
all associated controllers and devices must be varied off on the first AS/400.
Failure to do this will cause configuration errors on the second AS/400.
We recommend that you turn OFF Auto-Configure and manually
create the controller and device descriptions.
1. Power off both AS/400 hosts.
Use the following command to end all systems.
endsbs *all *immed
When all subsystems have ended enter the following:
pwrdwnsys *immed
2. Install the tape drive and the SCSI Switch.
3. Power on one of the AS/400 hosts.
4. Create the controller description.
Once the AS/400 completes the IPL, sign on as user QSECOFR.
At the command line, enter the command dsplclhdw. Scroll through
the local hardware screens and identify the 6790E/3490E that was just
installed. Locate the resource name associated with the controllers.
This resource name will be used when configuring the controller description.
Press F3 to return to the command line.
Enter the command crtctltap and press F4. This will display
the Create Controller Description screen.
Enter the required parameters to create the controller description.

18
SCSI SWITCH (FOR AS/400®)
Controller description . .TAPCTL01 (this is an example)
Controller type. . . . . 3490
Controller model . . . . .*ANY
Resource name. . . . . . .TAPCTL01 (must match name in step 4)
Online at IPL . . . . . . *YES
Text ‘description’ . . . .*BLANK
Once the controller description is completed, press F3 to return to the
command line.
5. Create the device description.
Enter the command crtdevtap and press F4. This will display the Create
Device Description screen.
Enter the required parameters to create the device description.
Device description . . . . TAP02 (this is an example)
Device type. . . . . . . . 3490
Device model . . . . . . . *ANY
Resource name. . . . . . . TAP02 (this is an example)
Switch setting . . . . . . 0
Online at IPL. . . . . . . *NO
Attached controller. . . .TAPCTL01 (this is an example)
Assign device at vary on . *YES
Unload device at vary off. *YES
Message queue. . . . . .QSYSOPR Choices are: name or QSYSOPR
Library . . . . . . *LIBL
Text ‘description’ . . . . *BLANK
Once the device description has been created press F3 to return
to the Main Menu.
Vary off the drive and controller. Repeat this process for the second
AS/400 starting with step 3.

19
SCSI SWITCH (FOR AS/400®)
Auto Configuration ON
Change the configuration of the tape unit. These changes will assist
in the allocate/deallocate of the tape unit.
1. Vary off tape unit, controller and tape device descriptions.
2. Issue the following commands:
CHGCTLTAP CTLD(TAPCTL01) ONLINE(*YES)
CHGDEVTAP DEVD(TAP01) ONLINE(*NO)
(TAPCTL01), TAP01 are used as examples.
• De-allocated state. The controller will be in a varied on status
and the tape device will be in a varied off status.
• Allocated state. The controller will be in an active status and
the tape device will be in a varied on status.
Software
The effective use of the SCSI Switch (for AS/400®) depends on changes
to the configurations and existing programs on the AS/400(s) that are
connected to the tape unit. The following items are only recommendations;
review them before implementing.
1. Change existing save programs and routines to issue the following
commands before and after using the tape unit:
ALLOCATE: VRYCFG CFGOBJ(TAP01) +
TAPE UNIT CFGTYPE(*DEV) STATUS(*0N)
DE-ALLOCATE: VRYCFG CFG0BJ(TAP01) +
TAPE UNIT CFGTYPE(*DEV) STATUS(*0FF)

20
SCSI SWITCH (FOR AS/400®)
2. Monitor messages for successfully allocating the tape unit. If (as an
example) System A has allocated a tape unit and System B makes a similar
request of the same tape unit, System B would receive a busy message.
The allocation failure will either send a message to the system operator’s
message queue, on System B, or the program that issued the allocation
request (via VRYCFG) can monitor for the message and automate the
response. Below are some of the messages that could be monitored for
(these messages as of V2R3 of OS/400):
CPF2640: ‘Vary Command Not Processed’
CPF6708 ‘Command Ended Due to Error’
3. Below is an example of a Control Language program that incorporates
the changes discussed.
/* This program will perform a SAVE LIBRARY NON-SYS*/
PGM (&TAPE)
DCL VAR(&TAPE) TYPE(*CHAR) LEN(10)
VRY VRYCFG CFG0BJ(&TAPE) CFGTYPE(*DEV) STATUS(*ON) 1
MONMSG MSGID(CPF2640 CPF6708) EXEC(DO) 2
DLYJOB DLY(300)
GOTO VRY
ENDDO
SAVLIB LIB(*NONSYS) DEV(&TAPE) ENDOPT(*UNLOAD)
VRYCFG CFGOBJ(&TAPE) CFGTYPE(*DEV) STATUS(*OFF)3
ENDPGM
Figure 4-1. Control Language Program.