TrueNAS CORETrueNAS CORE Nightly Development Documentation
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Failover (HA)

TrueNAS Enterprise
This article only applies to licensed TrueNAS Enterprise High availability (HA) systems. Contact the iXsystems Sales Team to inquire about purchasing TrueNAS Enterprise licenses.

Failover Configuration

System Failover Enterprise

Disable FailoverDisable automatic failover.
Default TrueNAS ControllerMake the currently active TrueNAS controller the default when both TrueNAS controllers are online and HA is enabled. To change the default TrueNAS controller, unset this option on the default TrueNAS controller and allow the system to fail over. This briefly interrupts system services.
Network Timeout Before Initiating FailoverThe number of seconds to wait after a network failure before triggering a failover. 0 means a failover occurs immediately or after two seconds when the system is using a link aggregation.
SYNC TO/FROM PEERSynchronizes the active and standby TrueNAS controllers.