cloudstack/docs/en-US/about-primary-storage.xml

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<section id="about-primary-storage">
<title>About Primary Storage</title>
<para>Primary storage is associated with a cluster, and it stores the disk volumes for all the VMs running on hosts in that cluster. You can add multiple primary storage servers to a cluster. At least one is required. It is typically located close to the hosts for increased performance.</para>
<para>&PRODUCT; is designed to work with all standards-compliant iSCSI and NFS servers that are supported by the underlying hypervisor, including, for example:</para>
<itemizedlist>
<listitem><para>Dell EqualLogic™ for iSCSI</para></listitem>
<listitem><para>Network Appliances filers for NFS and iSCSI</para></listitem>
<listitem><para>Scale Computing for NFS</para></listitem>
</itemizedlist>
<para>If you intend to use only local disk for your installation, you can skip to Add Secondary Storage.</para>
</section>