Originally posted by: djw

For the 2nd or 3rd time in a couple years, this morning I had a machine that appeared to be running fine, but was failing to dispatch tasks.  No filesystems were full.  You could log in normally in the shell and ls, browse files, etc., but any shell command of substance (i.e. ps, for example) just hung.  I could find no errors in any log.  Was unable to reboot from the shell (just hung) and had to restart the machine from the ASMI and then operated normally.

This machine has done this a couple of times with a long span in between and is not heavily loaded.  Interestingly the motherboard was replaced about 6 months ago but has exhibited this behavior before and after the replacement.  FWIW, it is rebooted monthly.

Any ideas on what this issue might be and where to look?  This machine is has a twin in the same cabinet that is configured almost identically and has a heavier workload and has never exhibited this behavior.

Thanks.