I just woke up to all my lights on and my server off. It was a power cut, but… Checking the logs for Proxmox, it seems to have lost memory… There were no logs for 10 days and when rebooting it said the system clock was off by as much (931,920 seconds = 10.7 days). What do? Anyone seen this before?
Your cmos battery is bad or your grid power was running below normal frequency
I don’t think that the grid frequency is used for PC timekeeping. You have internal timekeeping circuits. AC power stops at the PSU, and I don’t think that there’s any cable over which a time protocol flows from the PSU to the motherboard.
I feel like other things would have misbehaved if the power frequency was too low. And I’d expect the RTC to run well while power is on, and fail to accumulate time while power is off, but still remember the time at power off.
None of what I said above explains what we are seeing with our eyes though.