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80 lines
3.1 KiB
XML
80 lines
3.1 KiB
XML
<?xml version='1.0' encoding='utf-8' ?>
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<!DOCTYPE bookinfo PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN" "http://www.oasis-open.org/docbook/xml/4.5/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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<!-- Licensed to the Apache Software Foundation (ASF) under one
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or more contributor license agreements. See the NOTICE file
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distributed with this work for additional information
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regarding copyright ownership. The ASF licenses this file
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to you under the Apache License, Version 2.0 (the
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"License"); you may not use this file except in compliance
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with the License. You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing,
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software distributed under the License is distributed on an
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"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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KIND, either express or implied. See the License for the
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specific language governing permissions and limitations
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under the License.
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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,
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datacenters) containing host computers where guest virtual
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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>
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<para>
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Zone: Typically, a zone is equivalent to a single
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datacenter. A zone consists of one or more pods and secondary
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storage.
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</para>
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</listitem>
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<listitem>
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<para>
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Pod: A pod is usually one rack of hardware that includes a
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layer-2 switch and one or more clusters.
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</para>
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</listitem>
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<listitem>
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<para>
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Cluster: A cluster consists of one or more hosts and primary
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storage.
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</para>
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</listitem>
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<listitem>
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<para>
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Host: A single compute node within a cluster. The hosts are
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where the actual cloud services run in the form of guest
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virtual machines.
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</para>
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</listitem>
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<listitem>
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<para>
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Primary storage is associated with a cluster, and it stores
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the disk volumes for all the VMs running on hosts in that cluster.
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</para></listitem>
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<listitem>
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<para>
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Secondary storage is associated with a zone, and it stores
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templates, ISO images, and disk volume snapshots.
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</para>
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</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 documentation on cloud infrastructure concepts.</para>
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</section>
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