Availability Guide for Problem Management

Problem Management Tools
Availability Guide for Problem Management–125509
9-31
Where to Find More Information about ONS
Flow Control
ONS provides a flow-control mechanism to avoid sending unwanted subsystem data to
the network management platform. At startup, an event filter for all subsystems is
enabled. Filter tables in the ONSMIB (the MIB that defines the objects used to control
and communicate with $ZONS) allow you to disable event filtering for a given
subsystem, either for all events or for individual events.
Failure Recovery
ONS maintains a database (ONSDB), which contains a pointer to the last event
processed. Upon restart (either by you or by the Syshealth Persistence Monitor ($ZPER),
ONS restarts the consumer distributors with a starting point corresponding to the last
event timestamp saved in the ONSDB. If ONS finds these previous distributors still
running, ONS stops them, restarts them, and repositions them to the most current
position. If the ONSDB does not exist (thus preventing access to a previous log
timestamp), ONS positions the distributors according to the current system timestamp.
The ONSDB is then recreated with the current pointers.
Where to Find More Information about ONS
ONS is described in the SNMP Configuration and Management Manual.