Go Back   HowtoForge Forums | HowtoForge - Linux Howtos and Tutorials > Linux Forums > Kernel Questions

Do you like HowtoForge? Please consider supporting us by becoming a subscriber.
Reply
 
Thread Tools Display Modes
  #1  
Old 30th November 2009, 15:07
divine divine is offline
Junior Member
 
Join Date: Nov 2009
Posts: 13
Thanks: 4
Thanked 0 Times in 0 Posts
Default dom0 rebooting without any reason

Hello,

I have some kind of problem with my xen server.
Here is some basic info:
cat /proc/version
Linux version 2.6.26-2-xen-686 (Debian 2.6.26-17lenny2) (dannf@debian.org)
4gb ram
xeon 2ghz

two domus: with 2048 and 256 of memory.


Now, every two hours or so dom0 reboots without any reason, no log messages, nothing. If i stop xend (xend stop) then server works without any reboots perfectly. Please help me to identify problem, i know it is difficult because i have no information what can cause it. Hardware was tested throughtly for two weeks - everything is perfect.
It works without any gliches with xend started too except rebooting 'thing'.
Is there any way to 'catch dump' when that happens? (unfortunately kernel has no errors too)

Sincerely,
me
Reply With Quote
Sponsored Links
  #2  
Old 1st December 2009, 18:05
falko falko is offline
Super Moderator
 
Join Date: Apr 2005
Location: Lüneburg, Germany
Posts: 41,701
Thanks: 1,900
Thanked 2,735 Times in 2,571 Posts
Default

Did you check the logs on the host and the guests?
__________________
Falko
--
Download the ISPConfig 3 Manual! | Check out the ISPConfig 3 Billing Module!

FB: http://www.facebook.com/howtoforge

nginx-Webhosting: Timme Hosting | Follow me on:
Reply With Quote
  #3  
Old 1st December 2009, 20:07
divine divine is offline
Junior Member
 
Join Date: Nov 2009
Posts: 13
Thanks: 4
Thanked 0 Times in 0 Posts
Default

Yes.

Logs capture nothing...
So what i have got:
1. xend stop = no reboots everything is working
2. xend start = hangs every 2-3 hours randomly
3. xend start but with no domus running = hadn't crashed yet (about one full day).

my guess is RAM but i changed them, i don't know even how many times...
Reply With Quote
  #4  
Old 2nd December 2009, 16:49
falko falko is offline
Super Moderator
 
Join Date: Apr 2005
Location: Lüneburg, Germany
Posts: 41,701
Thanks: 1,900
Thanked 2,735 Times in 2,571 Posts
Default

That's really strange. Unfortunately I have no idea what could cause this...
__________________
Falko
--
Download the ISPConfig 3 Manual! | Check out the ISPConfig 3 Billing Module!

FB: http://www.facebook.com/howtoforge

nginx-Webhosting: Timme Hosting | Follow me on:
Reply With Quote
  #5  
Old 31st March 2010, 11:15
glycerin glycerin is offline
Junior Member
 
Join Date: Mar 2010
Posts: 2
Thanks: 0
Thanked 0 Times in 0 Posts
Default dom0 rebooting unexpectedly

Hi ..I have the same problem. The dom0 restart without any reason and no log available. It seems that all is ok but I can understand why these reboots random.
Did you find any solution?
I've updated the kernel release but nothing to do. All is strange and also I cannot release the VM for production use.
Any help?
Thanks glycerin
Reply With Quote
  #6  
Old 31st March 2010, 15:17
divine divine is offline
Junior Member
 
Join Date: Nov 2009
Posts: 13
Thanks: 4
Thanked 0 Times in 0 Posts
Default

Hi there,

I researched this problem for a whole year and never found anything.
But i have my own conclusions anyway.
What i did:
1. changed ram etc..
2. tested everything with everything possible
3. observations:
a) hanging occurs when clustered servers are put together
b) though it is very little possibility, but my conclusion is that somehow xen kernel+ glusterfs (sync) played a big role in this hanging. I played with various kernels and got to the point when only one server hangs constantly but other is ok.

(now i just have drbd+xen, running without problems atm)

Could you please write all the software you are using?
Reply With Quote
  #7  
Old 31st March 2010, 16:06
glycerin glycerin is offline
Junior Member
 
Join Date: Mar 2010
Posts: 2
Thanks: 0
Thanked 0 Times in 0 Posts
 
Default

Hi. Actually I'm using simpply the hypervisor only with 4 VM but only for testing.
Now we decided to reinstall the server because at first attempt I've compiled Xen and the xen-tools. In a second step I've decided to use the debian package and may be this approach has done something wrong in the hypervisor. These are only some hint to understand what's happening.
Thannks
Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
compiling Xen kernel as given on howtoforge tkmsr Kernel Questions 2 10th November 2009 18:29
CentOS 5.2 Domu on Ubuntu Hardy Dom0 Camran Installation/Configuration 5 3rd November 2009 10:57
Can't do it. Mono-Project BullyWug Installation/Configuration 6 15th April 2007 11:27
The Perfect Xen 3.0.3 Setup For Debian Sarge iptables problem on dom0 ren22 HOWTO-Related Questions 21 7th January 2007 19:32
Xen 3.0 Setup For Debian newb problem-No network connectivity on first dom0 boot BCNW HOWTO-Related Questions 4 22nd August 2006 14:24


All times are GMT +2. The time now is 02:20.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.