Hi Ezpeer, In addition to Tao’s point … The only time maintenance will power off a host outside of explicit administrative action is if that host’s board management controller is provisioned, the critical action for a sensor group has been changed to power cycle AND a sensor in that sensor group reports a debounced critical severity. If you are experiencing heartbeat failures that you are trying to debug you can change the heartbeat failure action to ‘degrade’ or ‘alarm’ only to avoid the recovery reboot. Not recommended, but available for debug. Ø system service-parameter-modify platform maintenance heartbeat_failure_action=degrade Ø system service-parameter-apply platform Locking a host will prevent host watchdog reboot due to quorum process failure or watchdog pet failure/timeout If you are experiencing autonomous host power off then I would look at the BMC logs for critical or fatal event reports. Eric. From: Liu, Tao [mailto:Tao.Liu@windriver.com] Sent: Friday, June 21, 2019 9:33 AM To: Ezpeer Chen; starlingx-discuss@lists.starlingx.io Subject: Re: [Starlingx-discuss] How to turn off fault management? Hi Ezpeer, The fault management reports fault conditions and significant events in the system and it does not reboot or power off the controller. The maintenance system takes proper actions to recover the system When necessary. I suggest you to view the active alarms and event history to see what failures might lead to reboot the controller for recovery. (could it be a configuration failure?). fm alarm-list fm event-list In addition, /var/log/mtcAgent.log provides more details on why the host is reboot or power-off. Regards, Tao From: Ezpeer Chen [mailto:ezpeerchen@gmail.com] Sent: Friday, June 21, 2019 4:08 AM To: starlingx-discuss@lists.starlingx.io Subject: [Starlingx-discuss] How to turn off fault management? Dear all, Environment: STX 1.0 (2018/10) all-in-one simplex How could i turn off fault management which cause my system(controller-0) reboot or power-off? Best Regards