Planned Network Outages

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:

Prepare a cluster for a planned network outage as follows:

  1. Stop the standby nodes.

  2. Have the outage.

  3. Restart the standby nodes.

Following these steps will not result in a failover, a split brain, or any interruption to Vocera service (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.