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eb0d79c64b
The existing 'chap' XML logic was never used - just defined. Rather than try to insert a square peg into a round hole, blow it up and rewrite the logic to follow the 'ceph' format. Remove the former "chap.login" and "chap.passwd" fields and replace with "chap.username" and "chap.secret" in _virStoragePoolAuthChap. Adjust the virStoragePoolDefParseAuthChap() to process. Change the rng file to describe the new layout Update the formatstorage.html to describe the usage of the secret element to mention that the secret type "iscsi" and "ceph" can be used to storage pool too. Update the formatsecret.html to include a reference to the storage pool Update tests to handle the changes from 'login' and 'passwd' to 'username' and '<secret>' format
509 lines
24 KiB
XML
509 lines
24 KiB
XML
<?xml version="1.0" encoding="UTF-8"?>
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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">
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<body>
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<h1>Storage pool and volume XML format</h1>
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<ul id="toc"></ul>
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<h2><a name="StoragePool">Storage pool XML</a></h2>
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<p>
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Although all storage pool backends share the same public APIs and
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XML format, they have varying levels of capabilities. Some may
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allow creation of volumes, others may only allow use of pre-existing
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volumes. Some may have constraints on volume size, or placement.
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</p>
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<p>
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The top level tag for a storage pool document is 'pool'. It has
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a single attribute <code>type</code>, which is one of <code>dir</code>,
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<code>fs</code>, <code>netfs</code>, <code>disk</code>,
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<code>iscsi</code>, <code>logical</code>. This corresponds to the
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storage backend drivers listed further along in this document.
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The storage pool XML format is available <span class="since">since 0.4.1</span>
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</p>
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<h3><a name="StoragePoolFirst">General metadata</a></h3>
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<pre>
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<pool type="iscsi">
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<name>virtimages</name>
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<uuid>3e3fce45-4f53-4fa7-bb32-11f34168b82b</uuid>
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<allocation>10000000</allocation>
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<capacity>50000000</capacity>
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<available>40000000</available>
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...</pre>
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<dl>
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<dt><code>name</code></dt>
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<dd>Providing a name for the pool which is unique to the host.
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This is mandatory when defining a pool. <span class="since">Since 0.4.1</span></dd>
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<dt><code>uuid</code></dt>
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<dd>Providing an identifier for the pool which is globally unique.
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This is optional when defining a pool, a UUID will be generated if
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omitted. <span class="since">Since 0.4.1</span></dd>
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<dt><code>allocation</code></dt>
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<dd>Providing the total storage allocation for the pool. This may
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be larger than the sum of the allocation of all volumes due to
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metadata overhead. This value is in bytes. This is not applicable
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when creating a pool. <span class="since">Since 0.4.1</span></dd>
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<dt><code>capacity</code></dt>
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<dd>Providing the total storage capacity for the pool. Due to
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underlying device constraints it may not be possible to use the
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full capacity for storage volumes. This value is in bytes. This
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is not applicable when creating a pool. <span class="since">Since 0.4.1</span></dd>
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<dt><code>available</code></dt>
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<dd>Providing the free space available for allocating new volumes
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in the pool. Due to underlying device constraints it may not be
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possible to allocate the entire free space to a single volume.
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This value is in bytes. This is not applicable when creating a
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pool. <span class="since">Since 0.4.1</span></dd>
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</dl>
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<h3><a name="StoragePoolSource">Source elements</a></h3>
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<p>
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A single <code>source</code> element is contained within the top level
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<code>pool</code> element. This tag is used to describe the source of
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the storage pool. It can contain the following child elements:
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</p>
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<pre>
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...
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<source>
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<host name="iscsi.example.com"/>
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<device path="demo-target"/>
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<auth type='chap' username='myname'>
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<secret type='iscsi' usage='mycluster_myname'/>
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</auth>
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<vendor name="Acme"/>
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<product name="model"/>
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</source>
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...</pre>
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<pre>
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...
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<source>
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<adapter type='fc_host' parent='scsi_host5' wwnn='20000000c9831b4b' wwpn='10000000c9831b4b'/>
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</source>
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...</pre>
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<dl>
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<dt><code>device</code></dt>
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<dd>Provides the source for pools backed by physical devices.
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May be repeated multiple times depending on backend driver. Contains
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a single attribute <code>path</code> which is the fully qualified
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path to the block device node. <span class="since">Since 0.4.1</span></dd>
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<dt><code>directory</code></dt>
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<dd>Provides the source for pools backed by directories. May
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only occur once. Contains a single attribute <code>path</code>
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which is the fully qualified path to the backing directory.
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<span class="since">Since 0.4.1</span></dd>
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<dt><code>adapter</code></dt>
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<dd>Provides the source for pools backed by SCSI adapters. May
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only occur once. Attribute <code>name</code> is the SCSI adapter
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name (ex. "scsi_host1". NB, although a name such as "host1" is
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still supported for backwards compatibility, it is not recommended).
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Attribute <code>type</code> (<span class="since">1.0.5</span>)
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specifies the adapter type. Valid values are "fc_host" and "scsi_host".
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If omitted and the <code>name</code> attribute is specified, then it
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defaults to "scsi_host". To keep backwards compatibility, the attribute
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<code>type</code> is optional for the "scsi_host" adapter, but
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mandatory for the "fc_host" adapter. Attributes <code>wwnn</code>
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(Word Wide Node Name) and <code>wwpn</code> (Word Wide Port Name)
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(<span class="since">1.0.4</span>) are used by the "fc_host" adapter
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to uniquely identify the device in the Fibre Channel storage fabric
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(the device can be either a HBA or vHBA). Both wwnn and wwpn should
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be specified (See command 'virsh nodedev-dumpxml' to known how to get
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wwnn/wwpn of a (v)HBA). The optional attribute <code>parent</code>
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(<span class="since">1.0.4</span>) specifies the parent device for
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the "fc_host" adapter.
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<span class="since">Since 0.6.2</span></dd>
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<dt><code>host</code></dt>
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<dd>Provides the source for pools backed by storage from a
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remote server. Will be used in combination with a <code>directory</code>
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or <code>device</code> element. Contains an attribute <code>name</code>
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which is the hostname or IP address of the server. May optionally
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contain a <code>port</code> attribute for the protocol specific
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port number. <span class="since">Since 0.4.1</span></dd>
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<dt><code>auth</code></dt>
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<dd>If present, the <code>auth</code> element provides the
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authentication credentials needed to access the source by the
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setting of the <code>type</code> attribute. The <code>type</code>
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must be either "chap" or "ceph". Additionally a mandatory attribute
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<code>username</code> identifies the username to use during
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authentication as well as a sub-element <code>secret</code> with
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a mandatory attribute <code>type</code>, to tie back to a
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<a href="formatsecret.html">libvirt secret object</a> that
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holds the actual password or other credentials. The domain XML
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intentionally does not expose the password, only the reference
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to the object that manages the password. The secret element
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<code>type</code> must be either "ceph" or "iscsi". Use "ceph" for
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Ceph RBD (Rados Block Device) network sources and use "iscsi" for CHAP
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(Challenge-Handshake Authentication Protocol) iSCSI targets.
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The <code>secret</code> element requires either a <code>uuid</code>
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attribute with the UUID of the secret object or a <code>usage</code>
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attribute matching the key that was specified in the
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secret object. <span class="since">Since 0.9.7 for "ceph" and
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1.1.1 for "chap"</span>
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</dd>
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<dt><code>name</code></dt>
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<dd>Provides the source for pools backed by storage from a
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named element (e.g., a logical volume group name).
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Contains a string identifier.
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<span class="since">Since 0.4.5</span></dd>
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<dt><code>format</code></dt>
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<dd>Provides information about the format of the pool. This
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contains a single attribute <code>type</code> whose value is
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backend specific. This is typically used to indicate filesystem
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type, or network filesystem type, or partition table type, or
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LVM metadata type. All drivers are required to have a default
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value for this, so it is optional. <span class="since">Since 0.4.1</span></dd>
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<dt><code>vendor</code></dt>
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<dd>Provides optional information about the vendor of the
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storage device. This contains a single
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attribute <code>name</code> whose value is backend
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specific. <span class="since">Since 0.8.4</span></dd>
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<dt><code>product</code></dt>
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<dd>Provides an optional product name of the storage device.
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This contains a single attribute <code>name</code> whose value
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is backend specific. <span class="since">Since 0.8.4</span></dd>
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</dl>
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<h3><a name="StoragePoolTarget">Target elements</a></h3>
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<p>
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A single <code>target</code> element is contained within the top level
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<code>pool</code> element. This tag is used to describe the mapping of
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the storage pool into the host filesystem. It can contain the following
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child elements:
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</p>
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<pre>
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...
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<target>
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<path>/dev/disk/by-path</path>
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<permissions>
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<owner>107</owner>
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<group>107</group>
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<mode>0744</mode>
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<label>virt_image_t</label>
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</permissions>
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<timestamps>
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<atime>1341933637.273190990</atime>
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<mtime>1341930622.047245868</mtime>
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<ctime>1341930622.047245868</ctime>
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</timestamps>
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<encryption type='...'>
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...
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</encryption>
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</target>
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</pool></pre>
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<dl>
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<dt><code>path</code></dt>
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<dd>Provides the location at which the pool will be mapped into
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the local filesystem namespace. For a filesystem/directory based
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pool it will be the name of the directory in which volumes will
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be created. For device based pools it will be the name of the directory in which
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devices nodes exist. For the latter <code>/dev/</code> may seem
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like the logical choice, however, devices nodes there are not
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guaranteed stable across reboots, since they are allocated on
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demand. It is preferable to use a stable location such as one
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of the <code>/dev/disk/by-{path,id,uuid,label</code> locations.
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<span class="since">Since 0.4.1</span>
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</dd>
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<dt><code>permissions</code></dt>
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<dd>Provides information about the default permissions to use
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when creating volumes. This is currently only useful for directory
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or filesystem based pools, where the volumes allocated are simple
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files. For pools where the volumes are device nodes, the hotplug
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scripts determine permissions. It contains 4 child elements. The
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<code>mode</code> element contains the octal permission set. The
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<code>owner</code> element contains the numeric user ID. The <code>group</code>
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element contains the numeric group ID. The <code>label</code> element
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contains the MAC (eg SELinux) label string.
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<span class="since">Since 0.4.1</span>
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</dd>
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<dt><code>timestamps</code></dt>
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<dd>Provides timing information about the volume. Up to four
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sub-elements are present,
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where <code>atime</code>, <code>btime</code>, <code>ctime</code>
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and <code>mtime</code> hold the access, birth, change and
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modification time of the volume, where known. The used time
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format is <seconds>.<nanoseconds> since the
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beginning of the epoch (1 Jan 1970). If nanosecond resolution
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is 0 or otherwise unsupported by the host OS or filesystem,
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then the nanoseconds part is omitted. This is a readonly
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attribute and is ignored when creating a volume.
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<span class="since">Since 0.10.0</span>
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</dd>
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<dt><code>encryption</code></dt>
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<dd>If present, specifies how the volume is encrypted. See
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the <a href="formatstorageencryption.html">Storage Encryption</a> page
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for more information.
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</dd>
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</dl>
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<h3><a name="StoragePoolExtents">Device extents</a></h3>
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<p>
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If a storage pool exposes information about its underlying
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placement / allocation scheme, the <code>device</code> element
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within the <code>source</code> element may contain information
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about its available extents. Some pools have a constraint that
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a volume must be allocated entirely within a single constraint
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(eg disk partition pools). Thus the extent information allows an
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application to determine the maximum possible size for a new
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volume
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</p>
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<p>
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For storage pools supporting extent information, within each
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<code>device</code> element there will be zero or more <code>freeExtent</code>
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elements. Each of these elements contains two attributes, <code>start</code>
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and <code>end</code> which provide the boundaries of the extent on the
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device, measured in bytes. <span class="since">Since 0.4.1</span>
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</p>
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<h2><a name="StorageVol">Storage volume XML</a></h2>
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<p>
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A storage volume will be either a file or a device node.
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The storage volume XML format is available <span class="since">since 0.4.1</span>
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</p>
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<h3><a name="StorageVolFirst">General metadata</a></h3>
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<pre>
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<volume>
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<name>sparse.img</name>
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<key>/var/lib/xen/images/sparse.img</key>
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<allocation>0</allocation>
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<capacity unit="T">1</capacity>
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...</pre>
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<dl>
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<dt><code>name</code></dt>
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<dd>Providing a name for the volume which is unique to the pool.
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This is mandatory when defining a volume. <span class="since">Since 0.4.1</span></dd>
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<dt><code>key</code></dt>
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<dd>Providing an identifier for the volume which is globally unique.
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This cannot be set when creating a volume: it is always generated.
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<span class="since">Since 0.4.1</span></dd>
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<dt><code>allocation</code></dt>
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<dd>Providing the total storage allocation for the volume. This
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may be smaller than the logical capacity if the volume is sparsely
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allocated. It may also be larger than the logical capacity if the
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volume has substantial metadata overhead. This value is in bytes.
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If omitted when creating a volume, the volume will be fully
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allocated at time of creation. If set to a value smaller than the
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capacity, the pool has the <strong>option</strong> of deciding
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to sparsely allocate a volume. It does not have to honour requests
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for sparse allocation though. Different types of pools may treat
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sparse volumes differently. For example, the <code>logical</code>
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pool will not automatically expand volume's allocation when it
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gets full; the user is responsible for doing that or configuring
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dmeventd to do so automatically.<br/>
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<br/>
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By default this is specified in bytes, but an optional attribute
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<code>unit</code> can be specified to adjust the passed value.
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Values can be: 'B' or 'bytes' for bytes, 'KB' (kilobytes,
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10<sup>3</sup> or 1000 bytes), 'K' or 'KiB' (kibibytes,
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2<sup>10</sup> or 1024 bytes), 'MB' (megabytes, 10<sup>6</sup>
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or 1,000,000 bytes), 'M' or 'MiB' (mebibytes, 2<sup>20</sup>
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or 1,048,576 bytes), 'GB' (gigabytes, 10<sup>9</sup> or
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1,000,000,000 bytes), 'G' or 'GiB' (gibibytes, 2<sup>30</sup>
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or 1,073,741,824 bytes), 'TB' (terabytes, 10<sup>12</sup> or
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1,000,000,000,000 bytes), 'T' or 'TiB' (tebibytes,
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2<sup>40</sup> or 1,099,511,627,776 bytes), 'PB' (petabytes,
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10<sup>15</sup> or 1,000,000,000,000,000 bytes), 'P' or 'PiB'
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(pebibytes, 2<sup>50</sup> or 1,125,899,906,842,624 bytes),
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'EB' (exabytes, 10<sup>18</sup> or 1,000,000,000,000,000,000
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bytes), or 'E' or 'EiB' (exbibytes, 2<sup>60</sup> or
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1,152,921,504,606,846,976 bytes). <span class="since">Since
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0.4.1, multi-character <code>unit</code> since
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0.9.11</span></dd>
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<dt><code>capacity</code></dt>
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<dd>Providing the logical capacity for the volume. This value is
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in bytes by default, but a <code>unit</code> attribute can be
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specified with the same semantics as for <code>allocation</code>
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This is compulsory when creating a volume.
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<span class="since">Since 0.4.1</span></dd>
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<dt><code>source</code></dt>
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<dd>Provides information about the underlying storage allocation
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of the volume. This may not be available for some pool types.
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<span class="since">Since 0.4.1</span></dd>
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<dt><code>target</code></dt>
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<dd>Provides information about the representation of the volume
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on the local host. <span class="since">Since 0.4.1</span></dd>
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</dl>
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<h3><a name="StorageVolTarget">Target elements</a></h3>
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<p>
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A single <code>target</code> element is contained within the top level
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<code>volume</code> element. This tag is used to describe the mapping of
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the storage volume into the host filesystem. It can contain the following
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child elements:
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</p>
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<pre>
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...
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<target>
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<path>/var/lib/virt/images/sparse.img</path>
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<format type='qcow2'/>
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<permissions>
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<owner>107</owner>
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<group>107</group>
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<mode>0744</mode>
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<label>virt_image_t</label>
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</permissions>
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<compat>1.1</compat>
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<features>
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<lazy_refcounts/>
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</features>
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</target></pre>
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<dl>
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<dt><code>path</code></dt>
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<dd>Provides the location at which the volume can be accessed on
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the local filesystem, as an absolute path. This is a readonly
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attribute, so shouldn't be specified when creating a volume.
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<span class="since">Since 0.4.1</span></dd>
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<dt><code>format</code></dt>
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<dd>Provides information about the pool specific volume format.
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For disk pools it will provide the partition type. For filesystem
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or directory pools it will provide the file format type, eg cow,
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qcow, vmdk, raw. If omitted when creating a volume, the pool's
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default format will be used. The actual format is specified via
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the <code>type</code> attribute. Consult the pool-specific docs for
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the list of valid values. <span class="since">Since 0.4.1</span></dd>
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<dt><code>permissions</code></dt>
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<dd>Provides information about the default permissions to use
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when creating volumes. This is currently only useful for directory
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or filesystem based pools, where the volumes allocated are simple
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files. For pools where the volumes are device nodes, the hotplug
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scripts determine permissions. It contains 4 child elements. The
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<code>mode</code> element contains the octal permission set. The
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<code>owner</code> element contains the numeric user ID. The <code>group</code>
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element contains the numeric group ID. The <code>label</code> element
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contains the MAC (eg SELinux) label string.
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<span class="since">Since 0.4.1</span>
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</dd>
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<dt><code>compat</code></dt>
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<dd>Specify compatibility level. So far, this is only used for
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<code>type='qcow2'</code> volumes. Valid values are <code>0.10</code>
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and <code>1.1</code> so far, specifying QEMU version the images should
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be compatible with. If the <code>feature</code> element is present,
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1.1 is used. If omitted, qemu-img default is used.
|
|
<span class="since">Since 1.1.0</span>
|
|
</dd>
|
|
<dt><code>features</code></dt>
|
|
<dd>Format-specific features. Only used for <code>qcow2</code> now.
|
|
Valid sub-elements are:
|
|
<ul>
|
|
<li><code><lazy_refcounts/></code> - allow delayed reference
|
|
counter updates. <span class="since">Since 1.1.0</span></li>
|
|
</ul>
|
|
</dd>
|
|
</dl>
|
|
|
|
<h3><a name="StorageVolBacking">Backing store elements</a></h3>
|
|
|
|
<p>
|
|
A single <code>backingStore</code> element is contained within the top level
|
|
<code>volume</code> element. This tag is used to describe the optional copy
|
|
on write, backing store for the storage volume. It can contain the following
|
|
child elements:
|
|
</p>
|
|
|
|
<pre>
|
|
...
|
|
<backingStore>
|
|
<path>/var/lib/virt/images/master.img</path>
|
|
<format type='raw'/>
|
|
<permissions>
|
|
<owner>107</owner>
|
|
<group>107</group>
|
|
<mode>0744</mode>
|
|
<label>virt_image_t</label>
|
|
</permissions>
|
|
</backingStore>
|
|
</volume></pre>
|
|
|
|
<dl>
|
|
<dt><code>path</code></dt>
|
|
<dd>Provides the location at which the backing store can be accessed on
|
|
the local filesystem, as an absolute path. If omitted, there is no
|
|
backing store for this volume.
|
|
<span class="since">Since 0.6.0</span></dd>
|
|
<dt><code>format</code></dt>
|
|
<dd>Provides information about the pool specific backing store format.
|
|
For disk pools it will provide the partition type. For filesystem
|
|
or directory pools it will provide the file format type, eg cow,
|
|
qcow, vmdk, raw. The actual format is specified via the type attribute.
|
|
Consult the pool-specific docs for the list of valid
|
|
values. Most file formats require a backing store of the same format,
|
|
however, the qcow2 format allows a different backing store format.
|
|
<span class="since">Since 0.6.0</span></dd>
|
|
<dt><code>permissions</code></dt>
|
|
<dd>Provides information about the permissions of the backing file.
|
|
It contains 4 child elements. The
|
|
<code>mode</code> element contains the octal permission set. The
|
|
<code>owner</code> element contains the numeric user ID. The <code>group</code>
|
|
element contains the numeric group ID. The <code>label</code> element
|
|
contains the MAC (eg SELinux) label string.
|
|
<span class="since">Since 0.6.0</span>
|
|
</dd>
|
|
</dl>
|
|
|
|
<h2><a name="examples">Example configuration</a></h2>
|
|
|
|
<p>
|
|
Here are a couple of examples, for a more complete set demonstrating
|
|
every type of storage pool, consult the <a href="storage.html">storage driver page</a>
|
|
</p>
|
|
|
|
<h3><a name="exampleFile">File based storage pool</a></h3>
|
|
|
|
<pre>
|
|
<pool type="dir">
|
|
<name>virtimages</name>
|
|
<target>
|
|
<path>/var/lib/virt/images</path>
|
|
</target>
|
|
</pool></pre>
|
|
|
|
<h3><a name="exampleISCSI">iSCSI based storage pool</a></h3>
|
|
|
|
<pre>
|
|
<pool type="iscsi">
|
|
<name>virtimages</name>
|
|
<source>
|
|
<host name="iscsi.example.com"/>
|
|
<device path="demo-target"/>
|
|
</source>
|
|
<target>
|
|
<path>/dev/disk/by-path</path>
|
|
</target>
|
|
</pool></pre>
|
|
|
|
<h3><a name="exampleVol">Storage volume</a></h3>
|
|
|
|
<pre>
|
|
<volume>
|
|
<name>sparse.img</name>
|
|
<allocation>0</allocation>
|
|
<capacity unit="T">1</capacity>
|
|
<target>
|
|
<path>/var/lib/virt/images/sparse.img</path>
|
|
<permissions>
|
|
<owner>107</owner>
|
|
<group>107</group>
|
|
<mode>0744</mode>
|
|
<label>virt_image_t</label>
|
|
</permissions>
|
|
</target>
|
|
</volume></pre>
|
|
</body>
|
|
</html>
|