SuperMicro boards at one time had a tendency to default IPMI to bridge mode on the primary NIC, which was horribly insecure. From what I remember, the utility to disable it only ran under Windows (WinPE in a ramdisk image was sufficient so you could boot it from an ISO).
Point is, make sure your IPMI hasn't attracted unwanted visitors. Regards Lloyd obsdml at loopw.com wrote: > On Tue, 26 May 2026 18:20:26 +0000 > "SlowServers Admin" <[email protected]> wrote: > > > Hi misc@, > > > > I have two Supermicro X9SBAA servers in a rack. These are Atom > > S1260 systems with 8GB of ECC memory. > > > > I noticed that one of them was beeping while flashing an alarm > > light. There were no symptoms otherwise, but obviously this is > > concerning. > > Is it possible that this is the IPMI side of that board throwing a fit? > Those have a nasty tendency to throw a loud beeping alarm as described, and > are a secondary isolated computer system running on the board. Maybe the > ipmi is going offline and whining independent of events on the main part of > the system? > > (fwiw, I am also in the X9SBAA + maxed out 8GB ECC club) > > > > > > I tried with spread spectrum on and off in the BIOS. PSU voltages > > looked normal. I eventually lowered the clock with setperf=1 and > > did not hear the alarm after that, but I'm not confident if it's > > going off or not. I wish I knew if it was going off because I > > don't want to annoy anyone else in the datacenter. It's a very > > loud alarm. > > > > Are there any interfaces exposed to OpenBSD (and maybe accessible > > through sysctl) that can tell me if an alarm is going off, or that > > might help me diagnose it? The system has never crashed or done > > anything weird otherwise. Maybe some way to see if there are ECC > > errors that are being fixed on the fly? > > > > Very perplexing. I would appreciate any tips you can suggest. > > > > Please include me in replies as this account is not on misc@. > > > > Thank you! > > > > -Slow Servers > > > >
