OpenVMS Cluster Systems - OpenVMS Systems - HP

Sample Programs for LAN Control
D.3 Stopping the NISCA Protocol
D.3.1 Stop the Protocol
To stop the NISCA protocol on a LAN adapter, perform the following steps:
Step Action
1 Use an account that has the PHY_IO privilege—you need this to run LAVC$STOP_
BUS.EXE.
2 Define the foreign command (DCL symbol).
3 Execute the foreign command (LAVC$STOP_BUS.EXE), followed by the name of the LAN
adapter on which you want to stop the protocol.
Example: The following example shows how to stop the NISCA protocol on LAN
adapter ETA0:
$ STOP_BUS:==$SYS$DISK[ ]LAVC$STOP_BUS.EXE
$ STOP_BUS ETA
D.3.2 Verify Successful Execution
When the LAVC$STOP_BUS module executes successfully, the following deviceattention
entry is written to the system error log:
DEVICE ATTENTION . . .
NI-SCS SUB-SYSTEM . . .
FATAL ERROR DETECTED BY DATALINK . . .
In addition, the following hexidecimal values are written to the STATUS field of
the entry:
First longword (00000001)
Second longword (00001201)
The error-log entry indicates expected behavior and can be ignored. However, if
the first longword of the STATUS field contains a value other than hexidecimal
value 00000001, an error has occurred and further investigation may be
necessary.
D.4 Analyzing Network Failures
LAVC$FAILURE_ANALYSIS.MAR is a sample program, located in
SYS$EXAMPLES, that you can edit and use to help detect and isolate a
failed network component. When the program executes, it provides the physical
description of your cluster communications network to the set of routines that
perform the failure analysis.
D.4.1 Failure Analysis
Using the network failure analysis program can help reduce the time necessary
for detection and isolation of a failing network component and, therefore,
significantly increase cluster availability.
Sample Programs for LAN Control D–3