Server Fault is a question and answer site for system and network administrators. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

I've recently installed a server in colocation, and my server is rebooting every 4.5-5.5 minutes. Regardless of the OS I run, it reboots. I have all ECC memory in the server, so it should correct errors if there is a bad bit in the memory, right? It's weird because it always happens about 4.5-5.5 minutes after bootup. My motherboard is a Supermicro X8DTL-iF. I read on a blog that another person had the problem, and supermicro recommended to do a BIOS update. Is this the right course of action?

share|improve this question
up vote 5 down vote accepted

Fixed this problem by disabled the Watchdog function in my BIOS. It was rebooting my server every five minutes for some really weird reason. Oh well, at least no hardware is bad! :)

share|improve this answer
Shouldn't this one be marked as the answer then? :) – emtunc Jan 16 '11 at 9:54
Probably because you did not isntall... the driver for it. Without a driver this is waht the watchdoc does. The driver is supposed to reset the timer every period (like 10 seconds). In case the computer freezes, the watchdog reboots. Without timer... ;) the watchdog reboots, too. – TomTom Jan 16 '11 at 11:24
@TomTom Bingo. This is a feature, not a bug. The whole point of the watchdog is to reboot your computer if it stops responding. 'Responding' is determined by having a piece of software poking the watchdog hardware at least every five minutes. If you didn't set up the software, the watchdog hardware will trip and reboot the machine, thinking that it has hung. – Ian Howson Mar 20 '14 at 6:09

Consistent lockups/reboots are often caused by heat problems. Make sure all your fans are spinning and nothing is blocking the airflow.

After that, certainly try the bios update, and plan on swapping out the memory too - you could have bad memory that's causing the reboots. ECC won't fix that.

share|improve this answer
Temperatures aren't a problem. The sensors are showing normal amounts of heat. The fans are spinning at a normal speed too. I'll take a trip (1.5hr drive.. urgh) down to the datacenter to do a bios update. I'll bring some extra RAM down to test with. I've emailed supermicro too, but I've heard their support sucks. – Andy Jan 16 '11 at 9:09
You could always double check that heat is not the problem by running several CPU intensive tasks to see if it still reboots in the 4.5-5min period – emtunc Jan 16 '11 at 9:53

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.