you receive this error because on your cluster configurations you have checked 
"Enable Memory Balloon Optimization", and on some of your VMs there aren't 
balloon driver available; if you don't want anymore this warning messages you 
can uncheck this under 

Clusters -> (select your cluster) edit -> Optimization -> uncheck Enable Memory 
Balloon Optimization

Best Regards
Amedeo Salvati


Date: Wed, 12 Nov 2014 07:59:33 +0000
From: Karli Sj?berg <karli.sjob...@slu.se>
To: "tdeme...@itsmart.hu" <tdeme...@itsmart.hu>
Cc: "users@ovirt.org" <users@ovirt.org>
Subject: Re: [ovirt-users] Balloon driver unavailable
Message-ID: <5F9E965F5A80BC468BE5F40576769F099DF97243@exchange2-1>
Content-Type: text/plain; charset="utf-8"

On Wed, 2014-11-12 at 08:35 +0100, Demeter Tibor wrote:
> Hi,
> 
> 
> I have a lot of centos 6 based vms and I have install "ovirt guest
> agent" for those vms. 
> But two vm always say "The balloon driver on xxxvm on hostX is
> requested but unavailable"
> I did check the virtio_balloon module are loaded on vms.
> 
> 
> Anybody can me help?
> 
> 
> Thanks in advance
> 
> 
> Tibor

> I see that too, but only on Windows 2008 R2 guests... No one else ever
> said anything about it, so I thought it was just me:)
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