docs/en-US/best-practices-primary-storage.xml

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<section id="best-practices-primary-storage">
        <title>Best Practices for Primary Storage</title>
        <itemizedlist>
            <listitem><para>The speed of primary storage will impact guest performance. If possible, choose smaller, higher RPM drives for primary storage.</para></listitem>
            <listitem><para>Ensure that nothing is stored on the server. Adding the server to &PRODUCT; will destroy any existing data</para></listitem>            
        </itemizedlist>
    </section>