docs/en-US/attaching-volume.xml

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<section id="attaching-volume">
    <title>Attaching a Volume</title>
    <para>You can attach a volume to a guest VM to provide extra disk storage. Attach a volume when you first create a new volume, when you are moving an existing volume from one VM to another, or after you have migrated a volume from one storage pool to another.</para>
        <orderedlist>
            <listitem><para>Log in to the &PRODUCT; UI as a user or admin.</para></listitem>
            <listitem><para>In the left navigation, click Storage.</para></listitem>
            <listitem><para>In Select View, choose Volumes.</para></listitem>
            <listitem><para>4.    Click the volume name in the Volumes list, then click the Attach Disk button<inlinemediaobject>
                <imageobject>
                    <imagedata fileref="./images/attach-disk-icon.png" />
                </imageobject>
                <textobject><phrase>AttachDiskButton.png: button to attach a volume</phrase></textobject>
            </inlinemediaobject>
                </para></listitem>
            <listitem><para>In the Instance popup, choose the VM to which you want to attach the volume. You will only see instances to which you are allowed to attach volumes; for example, a user will see only instances created by that user, but the administrator will have more choices.</para>
                <!-- <para>If the VM is running in the OVM hypervisor, the VM must be stopped before a new volume can be attached to it.</para> -->
            </listitem> 
            <listitem><para>When the volume has been attached, you should be able to see it by clicking Instances, the instance name, and View Volumes.</para></listitem>
        </orderedlist>
    </section>