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CLOUDSTACK-2402. DOC. Document volume snapshot enhancements for VMware.

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Jessica 2013-08-08 17:08:17 -07:00
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docs/en-US/snapshot-performance-vmware.xml Normal file
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<?xml version='1.0' encoding='utf-8' ?>
<!DOCTYPE section PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN" "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
<!ENTITY % BOOK_ENTITIES SYSTEM "cloudstack.ent">
%BOOK_ENTITIES;
]>
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<section id="snapshot-performance-vmware">
<title>VMware Volume Snapshot Performance</title>
<para>When you take a snapshot of a data volume on VMware, &PRODUCT; uses an
efficient storage technique to improve performance.</para>
<para>A snapshot is not immediately exported from vCenter to a mounted NFS
share and packaged into an OVA file format. This operation would consume time and resources.
Instead, the original file formats (e.g., VMDK) provided by vCenter are
retained. An OVA file will only be created as needed, on demand. To generate the OVA,
&PRODUCT; uses information in a properties file (*.ova.meta) which it stored along with
the original snapshot data. </para>
<note><para>For upgrading customers: This process applies only to newly created snapshots after upgrade to &PRODUCT;
4.2. Snapshots that have already been taken and stored in OVA format will continue to
exist in that format, and will continue to work as expected.</para></note>
<para/>
</section>

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docs/en-US/working-with-snapshots.xml
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<para>Snapshots may be taken for volumes, including both root and data disks. The administrator places a limit on the number of stored snapshots per user. Users can create new volumes from the snapshot for recovery of particular files and they can create templates from snapshots to boot from a restored disk.</para>
<para>Users can create snapshots manually or by setting up automatic recurring snapshot policies. Users can also create disk volumes from snapshots, which may be attached to a VM like any other disk volume. Snapshots of both root disks and data disks are supported. However, &PRODUCT; does not currently support booting a VM from a recovered root disk. A disk recovered from snapshot of a root disk is treated as a regular data disk; the data on recovered disk can be accessed by attaching the disk to a VM.</para>
<para>A completed snapshot is copied from primary storage to secondary storage, where it is stored until deleted or purged by newer snapshot.</para>
<xi:include href="snapshot-throttling.xml" xmlns:xi="http://www.w3.org/2001/XInclude" />
<xi:include href="automatic-snapshot-creation-retention.xml" xmlns:xi="http://www.w3.org/2001/XInclude" />
<xi:include href="incremental-snapshots-backup.xml" xmlns:xi="http://www.w3.org/2001/XInclude" />
<xi:include href="volume-status.xml" xmlns:xi="http://www.w3.org/2001/XInclude" />
<xi:include href="snapshot-restore.xml" xmlns:xi="http://www.w3.org/2001/XInclude" />
<xi:include href="snapshot-throttling.xml" xmlns:xi="http://www.w3.org/2001/XInclude" />
<xi:include href="snapshot-performance-vmware.xml" xmlns:xi="http://www.w3.org/2001/XInclude"/>
</section>