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cleaning up about-clusters.xml

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David Nalley 2012-10-17 21:57:16 -04:00 committed by Chip Childers
parent dcda0a1b3c
commit 93b2c5d426
1 changed files with 29 additions and 5 deletions
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34
docs/en-US/about-clusters.xml
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@ -24,9 +24,25 @@
<section id="about-clusters">
<title>About Clusters</title>
<para>A cluster provides a way to group hosts. To be precise, a cluster is a XenServer server pool, a set of KVM servers, a set of OVM hosts, or a VMware cluster preconfigured in vCenter. The hosts in a cluster all have identical hardware, run the same hypervisor, are on the same subnet, and access the same shared primary storage. Virtual machine instances (VMs) can be live-migrated from one host to another within the same cluster, without interrupting service to the user.</para>
<para>A cluster is the third-largest organizational unit within a &PRODUCT; deployment. Clusters are contained within pods, and pods are contained within zones. Size of the cluster is limited by the underlying hypervisor, although the &PRODUCT; recommends less in most cases; see Best Practices.</para>
<para>A cluster consists of one or more hosts and one or more primary storage servers.</para>
<para>
A cluster provides a way to group hosts. To be precise, a cluster is a
XenServer server pool, a set of KVM servers, a set of OVM hosts, or a
VMware cluster preconfigured in vCenter. The hosts in a cluster all
have identical hardware, run the same hypervisor, are on the same subnet,
and access the same shared primary storage. Virtual machine instances
(VMs) can be live-migrated from one host to another within the same
cluster, without interrupting service to the user.
</para>
<para>
A cluster is the third-largest organizational unit within a &PRODUCT;
deployment. Clusters are contained within pods, and pods are contained
within zones. Size of the cluster is limited by the underlying hypervisor,
although the &PRODUCT; recommends less in most cases; see Best Practices.
</para>
<para>
A cluster consists of one or more hosts and one or more primary storage
servers.
</para>
<mediaobject>
<imageobject>
<imagedata fileref="./images/cluster-overview.png" />
@ -34,6 +50,14 @@
<textobject><phrase>cluster-overview.png: Structure of a simple cluster</phrase></textobject>
</mediaobject>
<para>&PRODUCT; allows multiple clusters in a cloud deployment.</para>
<para>Even when local storage is used, clusters are still required. In this case, there is just one host per cluster.</para>
<para>When VMware is used, every VMware cluster is managed by a vCenter server. Administrator must register the vCenter server with &PRODUCT;. There may be multiple vCenter servers per zone. Each vCenter server may manage multiple VMware clusters.</para>
<para>
Even when local storage is used exclusively, clusters are still required
organizationally, even if there is just one host per cluster.
</para>
<para>
When VMware is used, every VMware cluster is managed by a vCenter server.
Administrator must register the vCenter server with &PRODUCT;. There may
be multiple vCenter servers per zone. Each vCenter server may manage
multiple VMware clusters.
</para>
</section>