[Users] non-operational state as host does not meet clusters' minimu CPU level.

Hi, everyone, if it's not the right mail list, pls point out.. thanks.. I am trying to install the ovirt on my Xeon E5-2650 process on Dell server, which is installed with Fedora 17. While I create a new host , which actually is the same server as overt-engine is running. The host is created ,and starting to "installing". But it ends with "Non operational state". Error: Host CPU type is not compatible with cluster properties, missing CPU feature: model_sandybridge. But in my cluster, I select "sandybridge" CPU, and my Xeon C5 is also in Sandy bridge family. And also this error lead my server reboot. Any help is appreciated. Btw: I have enable INTEL-VT in BIOS. And modprobe KVM and kvm-intel modules. . attached is screen shot for error.