Users Guide

Understanding Installation Types | Preparing for Installation
OMNM 6.5.3 Installation Guide 21
Clustered servers process using a round-robin method so that systems are protected from server
failure. With distributed Mediation servers (also called mediation agents), the system handles a
larger number and volume of traps and events. This is usually used with even larger systems, or
when the server will be processing a lot of traps.
Db High Availability Model
The optional Db High Availability (Db HA) model installs automatically and makes the
Application server clustered and load balanced. This option is used in carrier-class or very large
deployments. You can also configure Oracle or Mysql database installations for failover.
NOTE:
You can test failover by stopping a server process.
In the Db High Availability model, primary and secondary paired Mediation servers use
configurable heartbeats to monitor each others status. If the secondary Mediation server detects
that the primary is down, it takes over. The Application server also monitors the Mediation server
and generates an event/alarm if the primary Mediation server goes down. Configurable trap buffers
reduce trap loss during failover. Use configurable heartbeats to monitor each others status. If the
secondary Mediation server detects that the primary is down, it takes over. The Application server
also monitors the Mediation server and generates an event/alarm if the primary Mediation server
goes down. Configurable trap buffers reduce trap loss during failover.
Primary and secondary
clustered Application servers also use configurable heartbeats to monitor
each others status. If the primary fails, the secondary takes over and generates an event/alarm.
Clients and Mediation servers identify Applications server by partition name. This is the same for