If the one of the BIG-IQ systems becomes
inactive, the active BIG-IQ continues to manage traffic. If the inactive BIG-IQ becomes
healthy again in less than 3 hours, it automatically rejoins the BIG-IQ auto failover HA
configuration with no required intervention from you. But if the BIG-IQ has been down
for over 3 hours, you'll need to re-sync the database between the active BIG-IQ and the
newly-activated standby BIG-IQ.
BIG-IQ auto failover HA configuration has been inoperable for over 3 hours, you must
recreate the configuration by adding a standby BIG-IQ and a BIG-IQ DCD quorum back
to the standalone, active BIG-IQ.