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29 lines
1.8 KiB
XML
29 lines
1.8 KiB
XML
<?xml version='1.0' encoding='utf-8' ?>
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<!DOCTYPE bookinfo PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN" "file:///C:/Program%20Files%20(x86)/Publican/DocBook_DTD/docbookx.dtd" [
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<!ENTITY % BOOK_ENTITIES SYSTEM "cloudstack.ent">
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%BOOK_ENTITIES;
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]>
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<section id="cloud-infrastructure-overview">
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<title>Cloud Infrastructure Overview</title>
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<para>
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The Management Server manages one or more zones (typically, datacenters) containing host computers where guest virtual machines will run. The cloud infrastructure is organized as follows:
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</para>
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<itemizedlist>
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<listitem><para>Zone: Typically, a zone is equivalent to a single datacenter. A zone consists of one or more pods and secondary storage.</para></listitem>
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<listitem><para>Pod: A pod is usually one rack of hardware that includes a layer-2 switch and one or more clusters.</para></listitem>
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<listitem><para>Cluster: A cluster consists of one or more hosts and primary storage.</para></listitem>
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<listitem><para>Host: A single compute node within a cluster. The hosts are where the actual cloud services run in the form of guest virtual machines.</para></listitem>
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<listitem><para>Primary storage is associated with a cluster, and it stores the disk volumes for all the VMs running on hosts in that cluster.</para></listitem>
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<listitem><para>Secondary storage is associated with a zone, and it stores templates, ISO images, and disk volume snapshots.</para></listitem>
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</itemizedlist>
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<mediaobject>
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<imageobject>
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<imagedata fileref="./images/infrastructure_overview.png" />
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</imageobject>
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<textobject><phrase>infrastructure_overview.png: Nested organization of a zone</phrase></textobject>
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</mediaobject>
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<para><emphasis role="bold">More Information</emphasis></para>
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<para>For more information, see <xref linkend="cloud-infrastructure-concepts" />.</para>
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</section>
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