Hi, In oVirt environment, power manager should be enabled for the host to support VM high availability in the cluster. Various kinds of physical power management protocol are supported, ie., ALOM, ILO&etc. However, when the oVirt is running on a nested KVM environment, there is no feasible way to do the power management of the VDSM host(also a KVM virtual machine). A new protocol will be based on libvirt to achieve the power management of a virtual host. The new protocol can be named as "libvirtp". In oVirt engine, a new type will be added to power management---> type libvirtp power management--->address it will be the IP of the physical host where the virtual VDSM host is on when "libvirtp" is selected power management--->user name it will be the user name to the libvirtd service power management--->password it will be the password to the libvirtd service power management--->port it will be the port to the libvirtd service -- --- 舒明 Shu Ming Open Virtualization Engineerning; CSTL, IBM Corp. Tel: 86-10-82451626 Tieline: 9051626 E-mail: shuming@cn.ibm.com or shuming@linux.vnet.ibm.com Address: 3/F Ring Building, ZhongGuanCun Software Park, Haidian District, Beijing 100193, PRC