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105 lines
5.5 KiB
XML
105 lines
5.5 KiB
XML
<?xml version='1.0' encoding='utf-8' ?>
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<!DOCTYPE section 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="hypervisor-support-for-primarystorage">
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<title>Hypervisor Support for Primary Storage</title>
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<para>The following table shows storage options and parameters for different hypervisors.</para>
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<informaltable>
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<tgroup cols="5">
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<colspec colname="c1" colnum="1" colwidth="34%"/>
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<colspec colname="c2" colnum="2" colwidth="16%"/>
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<colspec colname="c3" colnum="3" colwidth="16%"/>
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<colspec colname="c4" colnum="4" colwidth="17%"/>
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<colspec colname="c5" colnum="5" colwidth="17%"/>
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<thead>
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<row>
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<entry/>
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<entry><para>VMware vSphere</para></entry>
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<entry><para>Citrix XenServer</para></entry>
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<entry><para>KVM</para></entry>
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</row>
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</thead>
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<tbody>
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<row>
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<entry><para><emphasis role="bold"><emphasis role="bold">Format for Disks, Templates, and
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Snapshots</emphasis></emphasis></para></entry>
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<entry><para>VMDK</para></entry>
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<entry><para>VHD</para></entry>
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<entry><para>QCOW2</para></entry>
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</row>
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<row>
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<entry><para><emphasis role="bold">iSCSI support</emphasis></para></entry>
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<entry><para>VMFS</para></entry>
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<entry><para>Clustered LVM</para></entry>
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<entry><para>Yes, via Shared Mountpoint</para></entry>
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</row>
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<row>
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<entry><para><emphasis role="bold">Fiber Channel support</emphasis></para></entry>
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<entry><para>VMFS</para></entry>
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<entry><para>Yes, via Existing SR</para></entry>
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<entry><para>Yes, via Shared Mountpoint</para></entry>
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</row>
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<row>
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<entry><para><emphasis role="bold">NFS support</emphasis></para></entry>
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<entry><para>Y</para></entry>
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<entry><para>Y</para></entry>
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<entry><para>Y</para></entry>
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</row>
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<row>
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<entry><para><emphasis role="bold">Local storage support</emphasis></para></entry>
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<entry><para>Y</para></entry>
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<entry><para>Y</para></entry>
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<entry><para>Y</para></entry>
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</row>
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<row>
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<entry><para><emphasis role="bold">Storage over-provisioning</emphasis></para></entry>
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<entry><para>NFS and iSCSI</para></entry>
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<entry><para>NFS</para></entry>
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<entry><para>NFS</para></entry>
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</row>
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</tbody>
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</tgroup>
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</informaltable>
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<para>XenServer uses a clustered LVM system to store VM images on iSCSI and Fiber Channel volumes
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and does not support over-provisioning in the hypervisor. The storage server itself, however,
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can support thin-provisioning. As a result the &PRODUCT; can still support storage
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over-provisioning by running on thin-provisioned storage volumes.</para>
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<para>KVM supports "Shared Mountpoint" storage. A shared mountpoint is a file system path local to
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each server in a given cluster. The path must be the same across all Hosts in the cluster, for
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example /mnt/primary1. This shared mountpoint is assumed to be a clustered filesystem such as
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OCFS2. In this case the &PRODUCT; does not attempt to mount or unmount the storage as is done
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with NFS. The &PRODUCT; requires that the administrator insure that the storage is
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available</para>
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<!-- <para>Oracle VM supports both iSCSI and NFS storage. When iSCSI is used with OVM, the &PRODUCT; administrator is responsible for setting up iSCSI on the host, including re-mounting the storage after the host recovers from a failure such as a network outage. With other hypervisors, &PRODUCT; takes care of mounting the iSCSI target on the host whenever it discovers a connection with an iSCSI server and unmounting the target when it discovers the connection is down.</para> -->
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<para>With NFS storage, &PRODUCT; manages the overprovisioning. In this case the global
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configuration parameter storage.overprovisioning.factor controls the degree of overprovisioning.
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This is independent of hypervisor type.</para>
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<para>Local storage is an option for primary storage for vSphere, XenServer, and KVM. When the
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local disk option is enabled, a local disk storage pool is automatically created on each host.
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To use local storage for the System Virtual Machines (such as the Virtual Router), set
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system.vm.use.local.storage to true in global configuration.</para>
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<para>&PRODUCT; supports multiple primary storage pools in a Cluster. For example, you could
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provision 2 NFS servers in primary storage. Or you could provision 1 iSCSI LUN initially and
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then add a second iSCSI LUN when the first approaches capacity.</para>
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</section>
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