Shelf Manager Failover - Emerson Centellis 2000 Shelf Release 3.0 Manual

Redundancy
The system manager performs the following steps:
1. Initiates a takeover on the standby shelf manager by running the script: sv_activate
2. Closes the HPI session
3. Moves its own active virtual IP address to the other interface
4. Reestablishes the HPI session to the active shelf manager with saHpiSessionOpen
5. Waits in saHpiResourcesDiscover until the active shelf manager will discover all
resources

10.2.3.3 Shelf Manager Failover

Failover is a process when the standby shelf manager becomes the active one because the
active shelf manager fails.
The reasons for the shelf manager failover can be:
Unexpected removal of the active shelf manager
Software failure of the active shelf manager
Failure of the switch through which the virtual IP address is routed
The system manager detects a failover because of timeouts of the HPI calls. The system
manager actions depend on network topology.
The system manager performs the following steps:
1. Closes the HPI session
2. Moves its own active virtual IP address to the other interface
3. Reestablishes the HPI session to the active shelf manager with saHpiSessionOpen
4. Waits in saHpiResourcesDiscover until the active shelf manager discovers all
resources.
If a shelf manager failover occurs in a system with IP planes that are connected with one
interlink (between external switches), the system manager can reach the active shelf manager
via the interlink. An IP plane failover is not needed and the connection to the applications via
the same interface as before is kept. If the virtual IP address of the shelf manager is used, a
plane failover is necessary.
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Centellis 2000 Shelf Release 3.0 Installation and Use (6806800L99F)