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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>13.4. Using Swift for Secondary Storage</title><link rel="stylesheet" type="text/css" href="Common_Content/css/default.css" /><link rel="stylesheet" media="print" href="Common_Content/css/print.css" type="text/css" /><meta name="generator" content="publican 2.8" /><meta name="package" content="Apache_CloudStack-Admin_Guide-4.0.0-incubating-en-US-1-" /><link rel="home" href="index.html" title="CloudStack Administrator's Guide" /><link rel="up" href="storage.html" title="Chapter 13. Working With Storage" /><link rel="prev" href="secondary-storage.html" title="13.3. Secondary Storage" /><link rel="next" href="working-with-snapshots.html" title="13.5. Working with Snapshots" /></head><body><p id="title"><a class="left" href="http://cloudstack.org"><img src="Common_Content/images/image_left.png" alt="Product Site" /></a><a class="right" href="http://docs.cloudstack.org"><img src="Common_Content/images/image_right.png" alt="Documentation Site" /></a></p><ul class="docnav"><li class="previous"><a accesskey="p" href="secondary-storage.html"><strong>Prev</strong></a></li><li class="next"><a accesskey="n" href="working-with-snapshots.html"><strong>Next</strong></a></li></ul><div xml:lang="en-US" class="section" id="working-with-volumes" lang="en-US"><div class="titlepage"><div><div><h2 class="title" id="working-with-volumes">13.4. Using Swift for Secondary Storage</h2></div></div></div><div class="para">
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A volume provides storage to a guest VM. The volume can provide for a root disk or an additional data disk. CloudStack supports additional volumes for guest VMs.
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Volumes are created for a specific hypervisor type. A volume that has been attached to guest using one hypervisor type (e.g, XenServer) may not be attached to a guest that is using another hypervisor type (e.g. vSphere, KVM). This is because the different hypervisors use different disk image formats.
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</div><div class="para">
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CloudStack defines a volume as a unit of storage available to a guest VM. Volumes are either root disks or data disks. The root disk has "/" in the file system and is usually the boot device. Data disks provide for additional storage (e.g. As "/opt" or "D:"). Every guest VM has a root disk, and VMs can also optionally have a data disk. End users can mount multiple data disks to guest VMs. Users choose data disks from the disk offerings created by administrators. The user can create a template from a volume as well; this is the standard procedure for private template creation. Volumes are hypervisor-specific: a volume from one hypervisor type may not be used on a guest of another hypervisor type.
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</div></div><ul class="docnav"><li class="previous"><a accesskey="p" href="secondary-storage.html"><strong>Prev</strong>13.3. Secondary Storage</a></li><li class="up"><a accesskey="u" href="#"><strong>Up</strong></a></li><li class="home"><a accesskey="h" href="index.html"><strong>Home</strong></a></li><li class="next"><a accesskey="n" href="working-with-snapshots.html"><strong>Next</strong>13.5. Working with Snapshots</a></li></ul></body></html>
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