3 ms·

I wonder what the BMC was doing to hurt performance. Maybe it was questionable DVFS that stopped when the BMC died? Poor fan management that caused thermal thro

I wonder what the BMC was doing to hurt performance. Maybe it was questionable DVFS that stopped when the BMC died? Poor fan management that caused thermal throttling?

dsr_ 4y ago
That's a pretty good guess: lots of BMCs have fan control, and turning it off should make all fans stay at max power. In a datacenter the odds of anyone noticing that the fans are always on high is practically nil, unless you are specifically monitoring fan RPM. Most folks don't bother, as what you are actually interested in is temperature.
- brugidou 4y ago
  We had an interesting incident where one of our datacenter temperature sensors kept on rising, and operators on site could clearly hear the noise increase of all servers going to max fan speed following a BMC "crash" triggered by a network loop on our IPMI lan. It took us a while to identify the issue and all systems were running fine, but we had to shut down many racks to avoid the temperature to rise too high.
- flemhans 4y ago
  Really high RPM fans may also stand out audibly in the data center