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<dl><dt><code>name</code></dt><dd>Providing a name for the pool which is unique to the host.
This is mandatory when defining a pool. <spanclass="since">Since 0.4.1</span></dd><dt><code>uuid</code></dt><dd>Providing an identifier for the pool which is globally unique.
This is optional when defining a pool, a UUID will be generated if
omitted. <spanclass="since">Since 0.4.1</span></dd><dt><code>allocation</code></dt><dd>Providing the total storage allocation for the pool. This may
be larger than the sum of the allocation of all volumes due to
metadata overhead. This value is in bytes. This is not applicable
when creating a pool. <spanclass="since">Since 0.4.1</span></dd><dt><code>capacity</code></dt><dd>Providing the total storage capacity for the pool. Due to
underlying device constraints it may not be possible to use the
full capacity for storage volumes. This value is in bytes. This
is not applicable when creating a pool. <spanclass="since">Since 0.4.1</span></dd><dt><code>available</code></dt><dd>Providing the free space available for allocating new volumes
in the pool. Due to underlying device constraints it may not be
possible to allocate the entire free space to a single volume.
This value is in bytes. This is not applicable when creating a
pool. <spanclass="since">Since 0.4.1</span></dd></dl>
A single <code>source</code> element is contained within the top level
<code>pool</code> element. This tag is used to describe the source of
the storage pool. It can contain the following child elements:
</p>
<pre>
...
<source>
<host name="iscsi.example.com"/>
<device path="demo-target"/>
</source>
...</pre>
<dl><dt><code>device</code></dt><dd>Provides the source for pools backed by physical devices.
May be repeated multiple times depending on backend driver. Contains
a single attribute <code>path</code> which is the fully qualified
path to the block device node. <spanclass="since">Since 0.4.1</span></dd><dt><code>directory</code></dt><dd>Provides the source for pools backed by directories. May
only occur once. Contains a single attribute <code>path</code>
which is the fully qualified path to the block device node.
<spanclass="since">Since 0.4.1</span></dd><dt><code>host</code></dt><dd>Provides the source for pools backed by storage from a
remote server. Will be used in combination with a <code>directory</code>
or <code>device</code> element. Contains an attribute <code>name</code>
which is the hostname or IP address of the server. May optionally
contain a <code>port</code> attribute for the protocol specific
<dl><dt><code>name</code></dt><dd>Providing a name for the volume which is unique to the pool.
This is mandatory when defining a volume. <spanclass="since">Since 0.4.1</span></dd><dt><code>key</code></dt><dd>Providing an identifier for the volume which is globally unique.
This is optional when defining a volume, a key will be generated if
omitted. <spanclass="since">Since 0.4.1</span></dd><dt><code>allocation</code></dt><dd>Providing the total storage allocation for the volume. This
may be smaller than the logical capacity if the volume is sparsely
allocated. It may also be larger than the logical capacity if the
volume has substantial metadata overhead. This value is in bytes.
If omitted when creating a volume, the volume will be fully
allocated at time of creation. If set to a value smaller than the
capacity, the pool has the <strong>option</strong> of deciding
to sparsely allocate a volume. It does not have to honour requests
for sparse allocation though. <spanclass="since">Since 0.4.1</span></dd><dt><code>capacity</code></dt><dd>Providing the logical capacity for the volume. This value is
in bytes. This is compulsory when creating a volume.
<spanclass="since">Since 0.4.1</span></dd><dt><code>source</code></dt><dd>Provides information about the underlying storage allocation
of the volume. This may not be available for some pool types.
<spanclass="since">Since 0.4.1</span></dd><dt><code>target</code></dt><dd>Provides information about the representation of the volume
on the local host. <spanclass="since">Since 0.4.1</span></dd></dl>
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. If omitted when creating a volume, the pool's
default format will be used. The actual format is specified via
the <code>type</code>. Consult the pool-specific docs for the
list of valid values. <spanclass="since">Since 0.4.1</span></dd><dt><code>permissions</code></dt><dd>Provides information about the default permissions to use
when creating volumes. This is currently only useful for directory
or filesystem based pools, where the volumes allocated are simple
files. For pools where the volumes are device nodes, the hotplug
scripts determine permissions. 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
