docs/en-US/resizing-volumes.xml

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<section id="resizing-volumes">
    <title>Resizing Volumes</title>
        <para>&PRODUCT; does not provide the ability to resize root disks or data disks; the disk size is fixed based on the template used to create the VM. However, the tool <ulink url="http://vmtoolkit.com/files/folders/converters/entry87.aspx/"> VHD Resizer</ulink>), while not officially supported by Cloud.com or Citrix, might provide a workaround. To increase disk size with VHD Resizer:</para>
        <orderedlist>
            <listitem><para>Get the VHD from the secondary storage.</para></listitem>
            <listitem><para>Import it into VHD Resizer.</para></listitem>
            <listitem><para>Resize the VHD.</para></listitem>
            <listitem><para>Upload the new VHD.</para></listitem>
            <listitem><para>Create a new VM.</para></listitem>
            <listitem><para>Take a snapshot, then create a new template from that snapshot.</para>
                <para>For more information, see <ulink url="http://support.citrix.com/article/CTX118608/"> How to Resize a Provisioning Server 5 Virtual Disk </ulink> at the Citrix Knowledge Center </para></listitem>
        </orderedlist>
</section>