Planned Network Outages

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:

1. Stop the standby nodes.

2. Have the outage.

3. 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.