Digital Equipment VAX 4000 Series Guide
VAX 4000
•
Troubleshooting and Diagnostics
Order Number: EK--386AA-T5-001
VAX 4000 Troubleshooting
and Diagnostics
Order Number EK-386AA-TS-001
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March
1990
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51284
This document was prepared using VAX DOCUMENT, Version 1.2.
Contents
Preface v
Chapter 1 Troubleshooting During Power-On
1.1 Autobooting
the
VAX
4000
System.
. . . . . . . . . . . . . . . . . . . .
1-1
1.2 Troubleshooting Power-On
Problems.
. . . . . . . . . . . . . . . . . .
1-1
Chapter 2 Troubleshooting During Normal Operation
Chapter 3 Running the MicroVAX Diagnostic Monitor (MDM)
3.1
Preparing
to
Run
MDM . . . . . . . . . . . . . . .
..
. . . . . . . . . . . .
3-2
3.1.1
Preparing
to
Run
MDM on Diskless
or
Tapeless
Systems.
3-2
3.1.2
Preparing
to
Run
MDM
on
RF-Series ISA
or
Hard
Disk..
3-2
3.1.3
Preparing
to
Run
MDM on a Dual-Host
System.
. . . . .
..
3-3
3.1.3.1
Preparing
to
Run
MDM on a Dual-Host
System
with
One Tape Drive
...............................
3-3
3.1.3.2
Preparing
to
Run
MDM on a Dual-Host
System
with
Two
Tape
Drives
..............................
3-4
3.2
Starting
MDM . . . . . . . . . . . . . . . . . . . . . .
..
...........
3-5
3.2.1 TK70
Instructions
...............................
3-5
3.2.1.1 Booting MDM
Manually.
. . . . . . . . . . . . . . . . . . . . . .
..
3-5
3.2.1.2 Booting MDM Using
Autoboot.
. . . . . . . . . . . . . . . . .
..
3-6
3.3 MDM
Introductory
Screen.
. . . . . . . . . . . . . . . . . . . . . . . . . .
3-7
3.4
Main
Menu
Options.
. . . . . . . . . . . . . . . . . . . . . . . .
..
. . . . .
3-7
3.4.1 Test
the
System.
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
..
3--8
3.4.2 Display
System
Configuration
and
Devices.
. . . . . . . . . . .
3-9
3.4.3 Display
the
System
Utilities
Menu
..................
3-12
3.4.3.1
IOADDRES.
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
..
3-13
3.4.4
Update
Drive
Unit
Number
for RRD40 . . . . . . . . . . . . .
..
3-13
iii
3.4.5 Display
the
Connect/Ignore
Menu.
. . . . . . . . . . . . . . . .
..
3-13
3.4.6 Select Single Device Tests
.........................
3-14
3.5
Exiting
MDM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
..
3-16
Appendix A
VAX
4000 Controls and Indicators
Index
Figures
3-1
The
Main
Menu.
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
..
3-7
3-2
Example
of
an
Unsuccessful
Test.
. . . . . . . . . . . . . . . . . . . . .
3-9
3-3
System
Configuration
and
Devices
Screen.
. . . . . . . . . . . .
..
3-10
3-4
Sample
System
Utilities
Menu.
. . . . . . . . . . . . . . . . . . . . .
..
3-13
3-5
The
Single Device Tests
Menu
. . . . . . . . . . . . . . . . . . . . . .
..
3-14
3-6
Example
of a Successful
Test.
. . . . . . . . . . . . . . . . . . . . . .
..
3-15
3-7
Example
of
an
Unsuccessful
Test.
. . . . . . . . . . . . . . . . . . .
..
3-15
A-l
VAX
4000 Controls
and
Indicators-Sheet
1 of 2 . . . . . . . .
..
A-2
A-2
VAX
4000 Controls
and
Indicators-Sheet
2 of2 . . . . . . . .
..
A-3
Tables
1-1
Troubleshooting Power-On
Problems.
. . . . . . . . . . . . . . . . . .
1-2
2-1
Troubleshooting Operation
Problems.
. . . . . . . . . . . . . . . .
..
2-1
Iv
Preface
Troubleshooting is
the
process
of
isolating
and
diagnosing problems
with
your
system. When
your
system
does
not
operate
as
described
in
Operation,
use
the
information
in
this
guide to diagnose
the
problem.
Using
the
diagram
in
Appendix
A,
follow
the
troubleshooting procedures
recommended
in
this
guide.
This
manual
contains
three
chapters:
•
Chapter
1 describes problems you
may
experience
at
power-on
and
corrective actions.
•
Chapter
2 describes problems you
may
have
during
normal
operation
of
your system
and
corrective actions.
•
Chapter
3 describes
the
MicroVAX.
Diagnostic Monitor (MDM), a
diagnostic tool you
can
use
to
test
your
system periodically
or
to isolate
a
particular
problem.
• AppendixA contains a
diagram
showing
the
location
of
the
controls
and
indicators.
The
troubleshooting techniques described
in
this
manual
do
not
identify all
possible problems
with
your system,
nor
do
the
actions suggested
remedy
all
problems.
If
the
actions suggested do not solve
the
problem, call your
Digital service representative.
NOTE:
You
will find a Glossary
in
the Operation
manual
to
help
with
word
definitions
and
acronyms.
v
Conventions
The
following conventions
are
used
in
this
book:
Convention
BOLD
NOTE
CAUfION
WARNING
vi
Meaning
A symbol
denoting
a
terminal
key
used
in
text
and
examples
in
this
book.
For
example, !
Break!
indicates
that
you
press
the
Break
key
on
your
terminal
keypad. !
Return!
indicates
that
you
press
the
Return
key
on
your
terminal
keypad.
A symbol
indicating
that
you
hold
down
the
Ctrl
key
while
you
press
the
Ckey.
This
bold
type
indicates
user
input.
For
example:
»>
BOOT
MOAO
This line shows
that
the
user
must
type
BOOT
MUAO
at
the
console
prompt.
Provides
general
information
about
the
current
topic.
Provides
information
to
prevent
damage
to
equipment
or
software.
Provides
information
to
prevent
personal
injury.
Chapter 1
Troubleshooting During Power-On
When
you power on your system,
the
VAX.
processor performs a series of
self-tests
and
start-up
routines. Aftersuccessful completion
of
the
self-tests,
if
the
Break
EnablelDisable switch
is
set
to disable,
the
system
attempts
to autoboot system software.
1.1
Autobooting the
VAX
4000 System
The
VAX.
4000 system
attempts
to boot
automatically
(autoboot) from a
specified drive
when
you
have
entered
the
Set
Boot command (SET BOOT
device name) from console mode.
The
system continues to boot from
the
specified device
each
time
it
is
powered on
until
you specify differently
by
entering
the
Set
Boot command again.
If
you
have
not
entered
the
Set
Boot command,
the
system
boots
automatically
from
the
Ethernet
port,
EZAO.
1.2 Troubleshooting Power-On Problems
If
you do
not
observe
the
correct power-on
and
boot sequence responses,
refer
to
the
descriptions
of
problems
and
corrective actions
in
Table
1-1.
If
the
actions listed do
not
solve
the
problem, call
your
Digital service
representative.
NOTE: Table
1-1
occasionally recommends
that
you
run
MDM
as a service
tool
to
help diagnose problems. Refer
to
Chapter 3
of
this
manual
for
instructions on using MDM.
Troubleshooting During Power-On 1-1
Table
1-1:
Troubleshooting Power-On Problems
Problem
Possible
Cause
Corrective
Action
Problems
During
Self-Tests
No response
when
the
power
switch
is
turned
on
(AC
Present
indica-
tor
is
not
lit).
AC
Present
indicator
is
lit,
DC
OK
is
not
lit.
The
system
has
power
(AC
Present
indicator
is
lit),
but
nothing
displays
on
the
console
terminal.
System
is
not
plugged
in.
No
power
at
the
wall
outlet.
Circuit
breaker(s)
(which
is
the
power switch)
has
tripped
(is
in
position0).
Set
the
power
switch
to
O.
Plug
in
the
system.
Set
the
power
switch
to
1.
Use
a different
wall
outlet,
or
check
the
circuit
breaker
controllingpower
to
the
wall outlet.
Set
the
power
switch
to
position
1.
If
the
circuit breaker{s)
trips
again,
call
your
Digital service
representative.
Power
cable
is
incorrectly
Set
the
power
switch
to
O.
Check
that
installed.
the
cable
is
fully
seated
in
the
socket.
Power
supply
or module
failure.
Set
the
power
switch
to
1.
Call
your
Digital
service
representa-
tive.
Console
terminal
is
turned
Turn
on
the
console
terminal.
off.
Console
terminal
is
off
line.
Console
terminal
cable
is
incorrectly installed.
Console
terminal
set-
up
has
not
been
done
correctly.
Baud
rate
setting
of
the
system
and
the
terminal
do
not
match.
Power-On Mode switch
on
the
console module
is
set
to
T.
Terminal
is
defective.
Put
the
terminal
on
line.
Refer
to
the
terminal
documentation
for
instructions.
Make
sure
the
cable
is
installed
properly
at
both
ends.
Reread
the
section,
Install
the
Console
Terminal,
in
your
Installation
manual.
Set
the
terminal
baud
rate
to
match
the
system.
The
normal
operating
setting
is
9600.
Set
the
switch
to
Run
(indicated
by
an
arrow).
Turn
off
terminal
and
turn
it
on
again
to
see
if
it
passes
its
self-tests.
If
it
fails self-tests, call
your
Digital service
representative.
1-2
VAX
4000 Troubleshooting and
DiagnostiCS
Table 1-1 (Cont.): Troubleshooting Power-On Problems
Problem
Possible
Cause
The
system
has
power Problem
with
CPU.
(AC
Present
and
DC OK
indicators
are
lit),
but
nothing
is
displayed
on
the
console
terminal.
The
system
has
power (DC
Problem
with
CPU.
OK
is
lit),
but
nothing
is
displayed
on
the
console
terminal.
The
LED
on
the
console module dis-
plays
an
E
or
F.
The
self-tests
halted
and
an
error
message
or er-
ror
summary
displays
on
the
console
terminal.
The
system
detected
an
error
while
running
its
self-tests.
Corrective
Action
Call
your
Digital service
representa-
tive.
Call
your
Digital service
representa-
tive.
Copy
the
number
following
the
ques-
tion
mark
in
the
error
message
or
sum-
mary
and
call your Digital service rep-
resentative.
The
Language
Selection
Menu
does
not
appear.
The
baud
rate
on
the
con-
Check
that
the
baud
rate
on
the
sole
terminal
is
different console
terminal
and
on
the
system
is
from
the
baud
rate
on
set
to 9600.
the
system.
The
terminal
does
not
sup-
Obtain
a
terminal
that
supports
MCS.
port
the
multi-national
character
set
(MeS).
General
Problems
During
Boot
Sequence
The
system
returns
to
the
BOOT
prompt
after
four
minutes.
Instead
of
automatically
starting,
system
power-
on
results
in
>>>
being
displayed
on
the
console
terminal.
Sanity
timer
is
enabled
on
the
DESQA module.
Break
EnablelDisable
switch
is
set
to
enable.
The
system
is
in
console
mode.
The
message
"154 No bootable
media
was
RETRY"
is
displayed
twice found.
on
the
console
terminal.
Disable
sanity
timer.
Refer
to
DESQA
Option Installation Guide.
To
autoboot,
set
the
Break
Enable!
Disable
switch
(located
on
the
console
module) to disable (down).
Reset
the
system
by
pressing
the
Restart
button,
located
on
the
System
Control
Panel.
If
you
prefer
to
boot
manually
from
console mode,
use
the
BOOT
command
(»>BOOT
device-name).
See
actions
listed
in
the
subsequent
sections
of
this
table
for
the
boot
device
you
are
using.
Troubleshooting During Power-On
1-3
Table 1-1 (Cont.): Troubleshooting Power-On Problems
Problem
The
countdown does
not
continue from 2
through
0, even
though
the
Break
EnablelDisable switch
is
set
to
disable.
Possible
Cause
The
system
cannot
load
system
software from ei-
ther
a
disk
drive, a
tape
drive,
or
the
Ethernet.
Corrective
Action
See
actions
listed
in
the
subsequent
sections
of
this
table
for
the
bootdevice
you
are
using.
Problems
Booting
from
an
RF-Series
Integrated
Storage
Assembly
(lSA)
The
countdown
continues
The
system
disk
is
write-
from
2
through
0,
how- protected.
The
Write-
ever,
the
console
termi-
Protect
button
is
in
(glows
nal
displays
operating
sys- orange).
tem
error
messages.
The countdown
continues
The
system
disk
contains
from 2
through
0, how- no bootable
system
soft-
ever,
the
console
termi-
ware.
nal
displays console
er-
ror
messages.
The
countdown does
not
continue from 2
through
0, even
though
the
Break
Enable!Disable
switch
is
set
to disable.
The
system
disk
is
off'
line. (The Ready
button
is
in
the
in
position.)
The
Fault
indicator
is
lit
or
begins to flash. A
problem
exists
with
the
controller or ISA.
Problems
Booting
from
a
Tape
Cartridge
System
does
not
boot
(the
countdown does
not
con-
tinue
from 2
to
0)
or
boots
from
another
device
(the
wrong software
is
displayed
on
the
consoleterminal).
No
tape
cartridge
in
the
tape
drive.
Push
in
and
release
the
Write-Protect
button
to
the
out
(unlit)position.
Make
sure
you know
which
Write-Protect
button
corresponds
to
the
system
disk.
Install
system
software.
Press
the
appropriate
Ready
button
on
the
system
disk
to
the
out
position.
Press
the
RestartlRun
button
on
the
SCPo
If
the
Fault
indicator
stops
flashing,
your
system
may
have
corrected itself.
Run
the
MDM
software
as
described
in
Chapter
3.
If
the
Fault
indicator
remains
lit,
call
your
Digital service
representative.
Insert
a
cartridge
containing
system
software
into
the
tape
drive.
1-4
VAX
4000 Troubleshooting and Diagnostics
Table
1-1
(Cont.): Troubleshooting Power-On Problems
Problem
Possible
Cause
Corrective
Action
Fixed-disk
drive
is
on
Place
the
fixed disk offline.
line. Your
system
starts
from
the
fixed disk,
if
it
is
on
line.
Tape
is
not
bootable
(does
Use
a
tape
containing
a
bootstrap
not
contain
a
bootstrap
program
to
start
system
software.
program).
Tape
is
worn
or
damaged.
Try
another
tape
cartridge.
A
problem
exists
with
Call
your
Digital
representative.
the
controller
or
tape
drive.
Troubleshooting
During
Power-On
1-5
Chapter 2
Troubleshooting During Normal
Operation
Problems
that
occur
during
normal
operation of
your
system
may
result
from a defect
in
the
system, from faulty settings,
or
from incorrect
procedures.
Table
2-1
lists problems, possible causes,
and
corrective actions.
If
the
actions listed do
not
solve
the
problem, call
your
Digital service
representative.
Table
2-1:
Troubleshooting Operation Problems
Problem
Possible
Cause
Corrective
Action
System
Problems
The
system
has
power
Problem
with
CPU.
(the
DC
OK
is
lit),
but
Call
your
Digital
service
representa-
tive.
nothing
displays on
the
console
terminal.
The
LED
on
the
console
module
displays
an
E
or
F.
System
loses power
dur-
ing
operation.
The
AC
Present
indicator
is
not
lit.
The
system
is
not
plugged
Set
the
power switch to
O.
Plug
in
the
into
the
wall outlet.
system.
Set
the
power
switch
to
1.
No
power
at
the
wall
Use
a different
wall
outlet,
or
check
the
outlet. circuit
breaker
controlling
power
to
the
wall
outlet.
Power
switch
has
tripped.
Set
the
power switch
to
1.
If
it
trips
again,
call
your
Digital
service
representative.
Power
cable
is
incorrectly
Set
the
power switch
to
O.
Check
that
installed.
the
cable
is
fully
seated
in
the
socket.
Set
the
power
switch
to
1.
Troubleshooting During Normal Operation 2-1
Table 2-1 (Cont.): Troubleshooting Operation Problems
Problem
Possible
Cause
Corrective
Action
System
loses
power
dur-
The
power
supply
has
ing
operation,
the
DC
OK
failed.
Check
the
DC
OK
light(s).
An
unlit
DC
OK
indicates
a
power
supply
problem.
Turn off
your
system
and
call
your
Digital
service
representative.
is
not
lit.
System
loses
power
dur-
ing
operation,
the
power
switch
is
off(position 0).
The
Over
Temperature
Condition
indicator
is
lit,
system
loses
power
during
operation.
System
loses
power
dur-
ing
operation.
The
Fan
Failure
indicator
is
lit.
System
halts
unexpect-
edly
during
normal
op-
eration.
The
consolemode
prompt>
>>
is
displayed
on
the
console
terminal.
System
suddenly
reboots.
The
power
switch,
which
also
acts
as
the
system
circuit
breaker,
has
tripped.
The
system
is
automat-
ically
shut
down
to
pre-
vent
overheating.
One
of
the
two
fans
has
failed.
To
reset
the
circuit
breaker,
turn
power
switch
to
off (position 0). Wait
30
seconds.
Set
switch
to
on
(position
1).
If
switch
trips
off
again,
call
your
Digital
service
representative.
Make
sure
vents
are
clear;
make
sure
system
is
not
near
a
heat
source;
make
sure
the
room
temperature
is
within
the
guidelines
in
the
VAX
4000 Site
Preparation.
Tum
power
switch
to off.
Wait five
minutes,
then
turn
switch
on.
If
switch
trips
off
again,
call
your
Digital
service
representative.
Call
your
Digital
service
representa-
tive.
The
IBreak1
key
or
CtrllP
Type "c"
and
press
IReturn
I.
To
on
the
console
terminal
prevent
recurrences,
set
the
Break
was
pressed
inadvertently.
EnablelDisable
switch
on
the
console
The
Hold
Screen
key
on
module
to
disable (position
0)
and
press
the
console
terminal
was
the
Run/Ready
button
to
restart
the
pressed
inadvertently.
system.
Note
that
pressing
Restart
The console
terminal
was
causes
the
system
to reboot.
momentarily
turned
off
or
disconnected.
The
Run/Ready
button
Let
rebooting
run
to
completion.
To
was
pressed
inadvertently.
prevent
recurrences,
you
can
disable
the
RestartlRun
button.
Call
your
Dig-
ital
service
representative
to
perform
this
service.
RF
-Series
Integrated
Storage
Assembly
(lSA)
Problems
ISA
write
error
message
is
displayed. ISA
is
write-protected.
(Write-
Protect
button
glows orange).
Press
and
release
Write-Protect
button
(not
lit).
2-2
VAX
4000 Troubleshooting
and
Diagnostics
(
\
Table 2-1 (Cont.): Troubleshooting Operation Problems
Problem
The
Fault
indicator
is
lit
or
begins
to flash.
ISA
read
error
message
is
displayed.
Possible
Cause
A problem
exists
with
the
controller
or
ISA.
Corrective
Action
If
Fault
indicator
stops
flashing,
the
system
may
have
corrected itself.
Run
the
MDM software
as
described
in
Chapter
3.
If
Fault
remains
lit,
call
your
Digital service
representative.
ISA
is
not
spun-up
be-
Press
the
Ready
button
to
the
out
cause
the
RunlReady
but-
position.
When
the
green
indicator
ton
is
in
the
in
position.
light
comes on,
the
ISA
is
available
for
use.
TK70
Tape
Drive
Problems
Green
light
blinks
rapidly
Tape
cartridge
leader
is
after
you
insert
the
tape.
defective.
Pull
the
handle
open
and
remove
the
cartridge.
Use
another
cartridge.
Orange,
yellow,
and
green
A problem
with
the
drive.
lights
blink
in
unison.
Press
the
Unload
button
once.
If
the
orange
and
green
lights
go
out
and
Handle
does
not
move.
Handle
does
not
lock.
Cartridge
does
not
un-
load.
TK70
passes
power-on
self-test
but
does
not
work.
the
yellow
light
blinks,
the
cartridge
is
unloading.
When
the
green
light
comes
on
and
you
hear
the
beep,
remove
the
tape
cartridge.
If
all
three
lights
continue
to
blink
after
you
press
the
Unload
button,
the
fault
is
not
cleared. Do
not
try
to
remove
the
cartridge.
Call
your
Digital service
representative.
Power-on
test
is
still
in
If
you
are
trying
to
insert
a
cartridge,
progress.
wait
for
the
orange
and
yellow
lights
to
go off
and
the
green
light
to
remain
on
steadily.
Then
try
again.
Tape drive
is
active.
Cartridge
is
not
inserted
properly.
Unload
button
is
not
working properly.
The controller
may
be
bad,
or
the
connection
between
the
drive
and
the
controller
may
be
loose.
Do
not
attempt
to
move
the
handle
while
the
yellow
light
is
on.
Reinsert
the
tape
cartridge.
If
the
problem
persists,
call
your
Digital
service
representative.
Try
unloading
the
cartridge
with
a
software command. Refer
to
your
system
software
manuals.
Call
your
Digital
service
representa-
tive.
Troubleshooting During Normal Operation
2-3
Chapter 3
Running the MicroVAX Diagnostic
Monitor (MOM)
The
MicroVAX Diagnostic Monitor (MDM) is a software package containing
diagnostic
tests
designed to isolate
and
identify faults
in
your
VAX
4000
system. MDM also
permits
you
to display
your
system configuration
and
test
how devices
work
together.
The
diagnostic
tests
are
packaged
with
your
system
on a
tape
cartridge
(labeled MV DIAG CUST
TKSO).
MDM
operating
instructions
begin
in
Section 3.2.
CAUTION:
If
your system is connected
to
a cluster, notify
your
cluster
manager before
halting
the system to load MDM.
You
generally
run
MDM
in
three
situations:
• Before you
install
system
software on a
new
system
•
When
you receive
an
error
message
or
experience a problem
with
your
system
•
When
you
want
to
test
your
system
periodically to
ensure
that
all
components
are
operating
correctly
How the MOM Tests Work
MDM
tests
individual
internal
devices
in
your
system, however,
it
performs
limited
diagnostics:
• MDM performs
reads
from
each
drive
and
checks
each
controller.
The
customer
tests
do
not
write
to
the
drives
as
writing
to
the
drives could
destroy
data.
NOTE:
MDM
will test a tapedrive or diskette drive only when the media
(tape or diskette) is inserted
in
the drive.
• MDM checks only devices
and
not
the
connections
or
lines between
peripheral
devices
and
the
system.
• MDM does
not
check
each
device
as
thoroughly
as
the
service diagnostic
tests, which
are
described below.
Running the MicroVAX Diagnostic Monitor (MOM) 3-1
If
devices
pass
the
customer
tests
but
you still experience problems, contact
a Digital service
representative
for
further
testing. (
Customers
requiring
more complete diagnostic
testing
should
purchase
the
MicroVAX
Maintenance
Kit.
The
maintenance
kit
includes
the
system
maintenance
guide
and
the
service diagnostic
tests.
The
MDM version
that
you receive
with
your
system
is a
subset
of
the
service version.
NOTE: Only qualified service personnel should use the service diagnostic
tests.
3.1
Preparing to
Run
MOM
Running
MDM on
certain
systems requires additional or special procedures.
Read Section 3.1.1
if
you
plan
to
run
MDM on a diskless
or
tapeless system.
Read Section 3.1.2
if
you
plan
to
install
MDM on a
hard
disk
or
RF-series
Integrated
Storage Assembly (lSA). Read Section 3.1.3
if
you
plan
to
run
MDM on a dual-host system.
3.1.1
Preparing to Run MDM on Diskless or Tapeless
Systems
If
you
have
a diskless
or
tapeless
system
that
is
part
of
a local
area
network
(LAN), you
must
obtain
the
Micro
VAX
Ethernet
Server
Customer
Diagnostics Kit.
Run
MDM
using
the
diagnostics
in
the
kit
that
is labeled
MV DIAG
ENET
CUST.
Refer to
the
MicroVAXDiagnostic Monitor Ethernet Server User's Guide
at
this
time. Once you
have
installed
and
down-line loaded MDM software,
refer
again
to
this
manual
for specific
instructions
on
running
MDM.
NOTE:
If
you have a diskless or tapeless system that is not part
of
a local
area network (LAN), you cannot run MDM. 7b diagnose problems, call a
Digital service representative.
3.1.2 Preparing
to
Run MDM on RF-Series ISA or Hard Disk
MDM software
can
be
installed
on
an
RF
-seriesISA
or
hard-disk
drive using
the
MDM
Hard
Disk Kit.
Installation
of
the
MDM
Hard
Disk
Kit
requires
the
completion
of
the
"Diagnostic Software
Installation
Acknowledgment"
by
the
customer. See
the
MicroVAX Diagnostic Monitor Hard Disk User's
Guide for
the
licensing
requirements
and
installation
instructions.
NOTE: The MDM Hard Disk Kit is required for dual-host systems where
one host is a tapeless system.
3-2
VAX 4000 Troubleshooting and Diagnostics
3.1.3 Preparing
to
Run
MOM
on
a Dual-Host System
In
a dual-host configuration, two
systems
in
the
same
VAXcluster
share
their
ISAs
through
a Digital
Storage
System
Interconnect
(DSSI)
bus.
Each
system
can
directlyaccess
any
of
the
ISAs
in
either
system;
this
can
include
a
shared
common
system
disk.
Before
running
MDM diagnostics on a
dual-host
system, your
system
must
be properly configured (systems ordered
as
dual-host systems
are
properly
configured
at
the
factory)
and
the
DSSI cable connecting
the
two
hosts
must
be
in
place.
Diagnostics
must
be performed
separately
for
each
host.
The
procedure
for
running
diagnostics differs
depending
on
whether
one
host
is
a
tapeless
system (no
tape
drive)
or
each
host
has
its
own
tape
drive. Use
the
following
instructions
to
prepare
to
run
diagnostics
in
a dual-host system
with
one
tape
drive. Use
the
instructions
in
the
section
after
it
to
prepare
to
run
diagnostics
in
dual-host systems
with
a
tape
drive
in
each
host.
3.1.3.1 Preparing
to
Run MOM on a Dual-Host System with One Tape
Drive
To
run
MDM on dual-host systems
with
one
tape
drive (one
tapeless
host)
you
must
use
the
MDM
Hard
Disk Kit. Complete
the
"Diagnostic Software
Installation
Acknowledgment"
and
install
the
kit
on
an
RF-series ISA
according to
the
procedure
in
the
MicroVAXDiagnostic Monitor Hard Disk
User's Guide.
When
the
installation
is complete,
use
the
following procedure
to
run
the
diagnostics:
1.
If
software is
installed
on
the
system,
warn
all
users
to log off
and
perform
system
shutdown,
as
described
in
your
system software
manuals.
Turn
off
both
hosts.
2.
Set
the
Break
EnablelDisable switch on
the
console module
of
each
host
to
enable
(up).
Turn
on
both
hosts.
If
the
hosts
are
already
powered-on,
press
Break.
Result:
The
system
displays
the
console mode
prompt
on
your
terminal.
»>
3. Use
the
command BOOT/IOO DIAn (for KA670 CPU-based DSSI)
or
BOOT/IOO DUAn (for K.FQSA-based DSSI),
where
n
is
the
unit
number
of
the
disk
containing
the
MDM
Hard
Disk Kit.
Result:
The
system
prompts for
the
bootfile:
Bootfile:
Running the MicroVAX Diagnostic Monitor (MOM)
3-3
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