en-US/hypervisor-kvm-requirements.xml

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<section id="hypervisor-kvm-requirements">
    <title>System Requirements for KVM Hypervisor Hosts</title>
  <para>KVM is included with a variety of Linux-based operating systems. Although you are not required to run these distributions, the following are recommended:</para>
  <itemizedlist>
    <listitem><para>CentOS / RHEL: 6.3</para></listitem>
    <listitem><para>Ubuntu: 12.04(.1)</para></listitem>
  </itemizedlist>
  <para>The main requirement for KVM hypervisors is the libvirt and Qemu version. No matter what
    Linux distribution you are using, make sure the following requirements are met:</para>
  <itemizedlist>
    <listitem><para>libvirt: 0.9.4 or higher</para></listitem>
    <listitem><para>Qemu/KVM: 1.0 or higher</para></listitem>
  </itemizedlist>
  <para>The default bridge in &PRODUCT; is the Linux native bridge implementation (bridge module). &PRODUCT; includes an option to work with OpenVswitch, the requirements are listed below</para>
  <itemizedlist>
    <listitem><para>libvirt: 0.9.11 or higher</para></listitem>
    <listitem><para>openvswitch: 1.7.1 or higher</para></listitem>
  </itemizedlist>
  <para>In addition, the following hardware requirements apply:</para>
  <itemizedlist>
    <listitem><para>Within a single cluster, the hosts must be of the same distribution version.</para></listitem>
    <listitem><para>All hosts within a cluster must be homogenous. The CPUs must be of the same type, count, and feature flags.</para></listitem>
    <listitem><para>Must support HVM (Intel-VT or AMD-V enabled)</para></listitem>
    <listitem><para>64-bit x86 CPU (more cores results in better performance)</para></listitem>
    <listitem><para>4 GB of memory</para></listitem>
    <listitem><para>At least 1 NIC</para></listitem>
    <listitem><para>When you deploy &PRODUCT;, the hypervisor host must not have any VMs already running</para></listitem>
  </itemizedlist>
</section>