Technical data

System Management Release Notes
5.8 OPCOM
CLUSTER
DEVICES
DISKS
LICENSE
NETWORK
OPER1 through OPER12
PRINTER
SECURITY
TAPES
When you specify an invalid class, all classes are enabled. This change causes
the error messages listed to reach as many operators as possible.
5.8.3 Handling OPC$ALLOW_INBOUND and OPC$ALLOW_OUTBOUND
V7.3
The algorithm formerly used by OPCOM when OPC$ALLOW_INBOUND and
OPC$ALLOW_OUTBOUND were set to FALSE was found to be too restrictive.
These logical names do not allow messages to flow into or out of the OPCOM
process.
When these logicals were used together in an OpenVMS Cluster, it was possible
for OPCOM processes on different systems in the cluster to stop communicating.
As a result, OPERATOR.LOG files would fill up with messages similar to the
following:
%%%%%%%%%%% OPCOM 29-APR-2000 11:33:31.73 %%%%%%%%%%%
OPCOM on AAAAA is trying again to talk to BBBBB, csid 00010001, system 00001
To correct this problem, the algorithm has been relaxed to allow OPCOM
processes in an OpenVMS Cluster to pass communication messages back and
forth between one another.
Compaq still recommends caution in the use of these logical names, which should
be used only by individuals who truly understand the impact to the entire system
if OPCOM messages are disabled in one or both directions.
5.8.4 Workstations in OpenVMS Clusters
V7.3
The default behavior of OPCOM is to not enable OPA0: on workstations in
clusters. OPCOM also does not enable the logfile, OPERATOR.LOG, on these
systems. The only exception is if the system is the first system into the cluster.
OPCOM determines whether a system is a workstation by testing if it has a
graphics device. This test is specifically:
F$DEVICE ("*", "WORKSTATION", "DECW_OUTPUT")
OPCOM is treating systems shipped with graphic devices as workstations. As a
result, OPA0: and OPERATOR.LOG are not enabled by default.
To override the default behavior, define the following logical names in
SYS$MANAGER:SYLOGICALS.COM to be TRUE:
• OPC$OPA0_ENABLE
• OPC$LOGFILE_ENABLE
5–12 System Management Release Notes