Active/Standby
From TBwiki
Active
Active is a module state that tells which application instance is operating the system.
Standby
Standby is another instance state that shows that this application instance doesn't do any actions and is waiting to takeover. As opposed to Master/Slave applications where the slave instance can still do actions.
Example
Example: toolpack_sys_manager is a active/standby type application. The active toolpack_sys_manager is the only instance that is taking action on the whole system, the slave toolpack_sys_manager is waiting to takeover in the eventuality where the active toolpack_sys_manager fails.
