Originally Posted by artvarck

One of our data centers has a Red Hat server, 2.6.32, with a strange and seemingly erratic hanging behavior. Every once in a while, up to 20 times a day, the server will hang while running even common commands such a "who" or "date." Nothing unusual logs to messages. No unusually high resource activity. I have a script that captures the period of time between running instances of the "date" command, with a sleep time of 15 seconds. 99% of the time there is a 15 second delay between the return of "date", but that 1% of the time where it can take 20-30 seconds is a real pain. I've watched top to see if excessive CPU activity is taking place, vmstat to watch for disk activity, free to check swap, ifconfig to look for retransmits, checked the switch for errors, but nothing is bearing fruit. What else should I be checking?

Thanks in advance.