docs/en-US/about-pods.xml

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<section id="about-pods">
    <title>About Pods</title>
    <para>A pod often represents a single rack. Hosts in the same pod are in the same subnet.
        A pod is the second-largest organizational unit within a &PRODUCT; deployment. Pods are contained within zones. Each zone can contain one or more pods.
        A pod consists of one or more clusters of hosts and one or more primary storage servers.
        Pods are not visible to the end user.
    </para>
    <mediaobject>
        <imageobject>
            <imagedata fileref="./images/pod-overview.png" />
        </imageobject>
        <textobject><phrase>pod-overview.png: Nested structure of a simple pod</phrase></textobject>
    </mediaobject>
</section>