A split-brain condition is a corrective response to a single
node failure of 2-node clusters, in which the WildFire high-availability
pair is no longer able to communicate with each other, but still
provides limited functionality. While high-availability and load-balancing
functionality is no longer available, you can still forward samples
to WildFire for analysis. When a split-brain occurs, it is due to
one of the following:
Hardware issues or a power outage.
Network connectivity issues, such as switch/router failures,
network flapping, or a network partition.
WildFire appliance configuration and connectivity issues.
Alto Networks recommends using a direct cable connection for the
HA1 and the cluster interface link.