Thanks, that worked.


From: Nitin kumar []
Sent: Tuesday, March 06, 2012 10:20 AM
To: Alex Jia
Cc: David M. Barlieb;
Subject: Re: [libvirt-users] can't add cpu's to virtual guest


Hi All,


We need to down the guest and edit the xml file and make the change on this .

To save the change in xml configuration file need to give the command #virsh definr <guest.xml>


It will save permanetly ...start the guest ...


No way to change this on line ....

On Mon, Mar 5, 2012 at 8:30 AM, Alex Jia <> wrote:

On 03/05/2012 04:49 AM, David M. Barlieb wrote:

I have a rhel6.0 server running kvm. I have recently needed to add additional cpu’s to some of the guests but cannot do it via virt-manager, can’t doit using virt, and can’t do it by vi the guest.xml file. Is this a bug or am I missing something?

Hi David,
The current kvm doesn't support vCPU hotplug, which will be supported in the future, so you can't change vCPU number for a running guest, it's a expected result.





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With Best Regards,
Nitin Kumar
Sr. System Engineer-Unix (CSC India Pvt. Ltd,  Noida )