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Using the VPO Application Programming Interfaces
The VPO Interfaces
Chapter 4 175
VPO’s Serial MSI Configuration File
The name of each MSI instance and the order number assigned to it are
stored in the configuration file /etc/opt/OV/share/conf/OpC/mgmt_
sv/msiconf. Both parallel and serial connections from the MSI are
possible at any point in the serial chain. The start number 0 (zero) is
allocated by default to the event-correlation manager, opcecm. Ascending
or descending order numbers indicate a serial connection: order numbers
of equal value indicate a parallel connection.
The message manager reads the configuration file whenever an MSI
instance opens a connection to the server MSI and then distributes the
messages according the values it finds in the file for the applications or
instances registered. Any MSI instance that is not listed in the
configuration file is assigned the order number 0, which means it
receives messages in parallel with the event-correlation agent process,
assuming the event-correlation agent is running. VPO allows you to
assign order numbers between -127 and 127: gaps are also allowed in the
sequence. You can change the order of individual instances while the
message manager is running: the message manager reads the
configuration file each time an instance connects (or reconnects) and
uses the new value it finds. However, the message manager continues
without interruption if an MSI instance disconnects itself or dies
suddenly.
NOTE The message manager ignores entries in the file
/etc/opt/OV/share/conf/OpC/mgmt_sv/msiconf that do not conform
to the format described and writes them instead to the opcerror log file.