TrueNAS SCALETrueNAS SCALE Nightly Development Documentation
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Failover Screen

TrueNAS Enterprise
This article only applies to SCALE Enterprise (HA) systems.

The System Settings > Failover screen displays settings used on SCALE Enterprise (HA) systems to turn the failover function on or off, sync the primary and standby controllers, and allow administrator users to configure failover. The main menu option and screen only display on Enterprise (HA) systems with the correct license applied.


Disable FailoverSelect to turn failover off. Leave clear to enable failover.
Default TrueNAS controllerSelect to make the current active controller the default controller when both TrueNAS controllers are online and HA is enabled. To change the default TrueNAS controller, leave unselected on the default TrueNAS controller and allow the system to fail over. This process briefly interrupts system services.
Network Timeout Before Initiating FailoverEnter a number in seconds to wait after a network failure before triggering a failover. Default is 0 which means failover occurs immediately, or after two seconds when the system is using a link aggregate.
Sync To PeerInitiates a sync operation that copies over the primary controller configuration to the standby controller. Opens the Sync To Peer dialog to confirm the operation.
Sync From PeerInitiates a sync operation that copies over the standby controller configuration to the primary controller.

Sync To or From Peer

Sync To Peer and Sync From Peer buttons each open a confirmation dialog before SCALE performs the operation requested.


Reboot standby TrueNAS controllerSelect to cause the standby controller to reboot after the sync operation completes.
ConfirmSelect to confirm you want to perform the sync-to-peer operation.
ProceedBegins the sync operation.