|About Vocera Voice Server Clusters / Network Problems and Clustering|
Following these steps will prevent failovers, a split brain, or an interruption to Vocera services.
Any network outage—even a momentary one—may result in a split brain, depending on the exact timing. When the network connection between the active node and a standby is interrupted, the standby goes into discovery mode, and one of the following situations will occur:
If the network is available again at the time the standby node goes into discovery mode, the standby will find the active node and reconnect to it as a standby—no failover or split brain will occur. This outcome is not likely.
If the standby node goes into discovery and cannot find the active node, it will come online as an active node, resulting in a split brain.
Prepare a cluster for a planned network outage as follows:
Stop the standby nodes.
Have the outage.
Restart the standby nodes.
These steps will help prevent any interuption to server, except for badges that cannot find a path to the active node because they were isolated by the outage.
If you do unintentionally create a split brain during a planned network outage, recover from it as described in Manually Rejoining a Split Brain.