Hi,

i found this KB Article that should solve your problem:

https://www.dell.com/support/kbdoc/en-us/000141663/dell-poweredge-idrac9-rac0182-the-idrac-firmware-was-rebooted

If you need further assistance please contact us again with details about your system(system-type firmware etc.).

Regards Martin

Hi,

It can be triggered by a power drain, or the system got halted with the power cord being removed.

"AC" is most of the time linked to the power.

Did you notice an unexpected shutdown ? Do you see a CPU resetting event in the LCC log ?

No it doesn't. I just noticed an unexpected reboot after some time

Hi,

did something change after following the guide from my link?

Regards Martin

Hi,

Currently there is no sign of unexpected reboot after 4 hours of usage. I think it should be fine now. 

I am seeing the same unexpected reboot on idrac 4.20.20.20. The link you provided has reason "watchdog" which doesn't apply here. In my case the reason is "ac" along with CPU resetting.

RAC0182 The iDRAC firmware was rebooted with the following reason: ac.

There is info messages for power supply status as well. Is this a power supply issue?

PSU0800 Power Supply 2: Status = 0x1, IOUT = 0x0, VOUT= 0x0, TEMP= 0x0, FAN = 0x0, INPUT= 0x0.

PSU0800 Power Supply 1: Status = 0x1, IOUT = 0x0, VOUT= 0x0, TEMP= 0x0, FAN = 0x0, INPUT= 0x0.

Looks like there was a power interruption on the server. iDRAC rebooted with ac means there is a power lost and restore on the server. Is the server also rebooted on the same time? Can you check is there any power distribution happened to the server? Are you seeing this message regularly?