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NETWORK FAILURE PROCESSING
I
The normal procedure for terminating the network is to
enter
the
NOP
commands
IDLE,NETWORK
or
DISABLE,NETWORK (refer to section 7). However, there
may be times when a network program
fails or the entire
network fails. When this happens, there is a flashing tape
request on the B display for a 7 -track labeled tape to be
used for network dumps. t You can assign the tape by using
the ASSIGN command or select other dump options by
setting sense switches 1 through 4. Your entry must be in
the following format:
n.ONSWx
n
Control
point
number
to
which
NAM
is
assigned.
x
Sense switch number.
Following are options available and the action you must
take to implement them.
Print network dumps
Enter n.ONSW1. and terminate the tape request
(by DROP command).
Copy network dumps to 7-track labeled tape and print
them
Enter n.ONSW2. and assign a 7-track labeled tape.
Copy network dumps to 9-track labeled tape
Enter n.ONSW3. and terminate the tape request
for a 7-track tape. The system reissues a tape
request for a 9-track labeled tape.
Assign a
9-track labeled tape.
Do not print network dumps
Enter n.ONSW4. The system sets the output file
to ID 67B.
The network dumps are not printed
until a printer has this ID. This allows the use of
the QDUMP utility to collect the network dumps
on
tape
(refer
to
the
System
Maintenance
Reference Manua!).
Sense switch 4 is effective
only if sense swi tch 1 or 2 is also set.
I
If there are no 7-track tape units available (no MT device
types in EST) when you enter n.ONSW2, the system issues a
request for a 9-track labeled' tape as if you entered
n.ONSW3. If there are no 9-track tape units available (no
NT device types in EST) when you enter n.ONSW3, the
system prints network dumps as if you entered n.ONSW1.
Once set, the sense switches can be turned off again by
entering n.OFFSWx. (n is the control point number of NAM
and x is the sense switch number). Sense switch 1 has
precedence over sense switches 2 and 3. The default is to
copy network dumps to a 7-track labeled tape but not to
print them (no sense switch is turned on).
I
NOTE
I
The sense switches are ·off by default and
should be turned on or off only when there
is a flashing tape request on the B display
after a network program fails or the entire
network fails.
If the sense switches are
turned on or off at any other time, the
resul ts are unpredictable.
If a noncritical network program (NS, RBF, or TVF) fails,
the sense switch settings affect only the failing program.
If the entire network fails, the sense switch settings affect
all network programs except IAF and TAF.
If an irrecoverable tape parity error occurs, the tape
request is reissued and you can assign a new tape or use any
of the dump options described previously.
If the terminal verification facility (TVF) or NS fails, the
system automatically restarts them after they are dumped
to tape or printed. However, if there is no GO statement
in the NS input record, you must enter the following
command to initiate NS.
n.CFO.GO.
n
Control point number of NAM.
Because TVF is started only when the network is initiated,
do not disable TVF.
When the NPU or the network fails, the contents of the
NPU are automatically dumped and reloaded. To prevent
the NPU from being dumped, enter the following command
after every load of the NPU.
DUMP ,npu,OFF.
npu
Name assigned to NPU.
If the previous network had terminated normally, a tape
request appears on the B display after the NPU is dumped
to copy the dump to tape. Again, you can assign a tape or
use any of the dump options described previously.
After a level 3 deadstart recovery, the network procedure
files terminate without printing anything.
You can bring the network back up after it fails without
waiting for all the network dumps to be copied to tape or
printed. This can be done when the flashing tape request
appears on the B display.
tThese procedures for copying network dumps to tape do not apply to IAF or TAF.
60435600 L
1-1
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