I have just had a very disconcerting experience. I have an HP DL360 gen 9 which appears to have spontaneously died. When power cycled it started OK. There was nothing obvious in the dmesg log.
I note the server is in a data center, and has, if I recall correctly A/B power, with UPS. I don't believe any other systems were affected.
Unfortunately the server is remote, so I was relying on remote hands, but I understand that after it stopped responding all lights were flashing lights 8 times, then waiting, then doing this again. From my reading of https://support.hpe.com/hpesc/public/docDisplay?docId=emr_na-c04444491 this seems to imply a "Power Backplane or storage Backplane" fault.
As per insite from from @MichaelHampton I have managed to pull the log IML log, which states:
0131 Critical 09:47 09/14/2020 09:47 09/14/2020 0001 LOG: Server Critical Fault (Service Information: Runtime Fault, SAS Backplanes, Storage Backplane 1 (01h))
Does anyone know the common causes for the above error and how alarmed I should be?