CONFIGURATION SCENARIOS
SNAP PAC Redundancy Option User’s Guide
8
Configuration Scenarios
As shown below there are three basic configuration scenarios. Depending on the level of protection
you require at your site, you may want to place the controllers in the same cabinet or in different
cabinets. Or you might want to put the arbiter in a different room or cabinet.
Keep the following things in mind when deciding how to configure your system:
•
The system will continue to run if any single component fails or in any situation where the
currently active controller does not fail and can still communicate to I/O.
•
If both the arbiter and the active controller fail simultaneously, or if the active controller fails
while the arbiter is already down, the backup will not be able to take over.
Scenario 1: Controllers and arbiter are in the same cabinet
Scenario 2: Controller 1 and Controller 2 are in separate cabinets or rooms, and the arbiter
is placed in the same cabinet or room as one of the controllers
Scenario 3: Controller 1, Controller 2, and the arbiter are in separate cabinets or rooms
