Based on the BMC event logs, the system is restarted automatically when the watchdog overflows every 20 minutes.
The BMC watchdog automatically restarts the OS after checking that the OS fails to start during OS loading. See Figure 2.
Figure 2 Watchdog settings
By default, the BMC watchdog timer (WDT) is disabled. The WDT is enabled when the WDT driver is at the upper layer of the OS. During OS installation, the WDT does not take effect, and the installation duration exceeds 20 minutes. Therefore, the BMC WDT forcibly restarts the system when the OS is being installed.
The BMC WDT takes effect and forcibly restarts the system during OS installation.