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Re: [fedora-virt] Fedora 11 on XEN Host



On Thu, Dec 17, 2009 at 01:49:48PM -0800, sungsoo khim wrote:
> Excuse if this was already discussed. (few hours of searching didn't 
> really help out)
> 
> We have some server running Cent OS 5.4 as Dom0, and a few more fedora 
> 11 running on top of them using XEN.
> 
> From time to time, one or two of our fedora VM's Load Index will rise 
> up to 100+ over 8 hour period. (In a very linear fashion)
> 
> When we see the trend starting (regardless of the Load index number at 
> the moment) we are not able to login using SSH or even console (xm 
> console [VMNAME]).
> 
> Only way to deal with it is to reboot the VM, and there is no 
> significant log entry at all. to indicate any system specific errors. 
> (As if nothing has happened) However, no log message are present during 
> the high load period.
> 
> When it happens however, active running process will reply back - such 
> as web proxy process. All socket open requests work as should (SSH, 
> HTTP, etc), but will not go further than opening the socket with a 
> greeting message.
> 
> Has anyone had similar experience, and fund a resolution to?
> 

- Are the Fedora guests PV or HVM? 
- Do CentOS guests work OK? 
- Does dom0 have load, big cpu-usage or io-wait? 
- What does "xm top" say?

-- Pasi


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