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        <article role="main" id="furo-main-content">
          <section id="dell-powerflex-powerflex">
<span id="storage-powerflex"></span><h1>Dell PowerFlex - <code class="docutils literal notranslate"><span class="pre">powerflex</span></code><a class="headerlink" href="#dell-powerflex-powerflex" title="Link to this heading">¶</a></h1>
<p><a class="reference external" href="https://www.dell.com/en-us/shop/powerflex/sf/powerflex">Dell PowerFlex</a> is a software-defined storage solution from <a class="reference external" href="https://www.dell.com/">Dell Technologies</a>. Among other things it offers the consumption of redundant block storage across the network.</p>
<p>LXD offers access to PowerFlex storage clusters using either NVMe/TCP or Dell’s Storage Data Client (SDC).
In addition, PowerFlex offers copy-on-write snapshots, thin provisioning and other features.</p>
<p>To use PowerFlex with NVMe/TCP, make sure you have the required kernel modules installed on your host system.
On Ubuntu these are <code class="docutils literal notranslate"><span class="pre">nvme_fabrics</span></code> and <code class="docutils literal notranslate"><span class="pre">nvme_tcp</span></code>, which come bundled in the <code class="docutils literal notranslate"><span class="pre">linux-modules-extra-$(uname</span> <span class="pre">-r)</span></code> package.
LXD takes care of connecting to the respective subsystem.</p>
<p>When using the SDC, LXD requires it to already be connected to the Dell Metadata Manager (MDM) beforehand.
As LXD doesn’t set up the SDC, follow the official guides from Dell for configuration details.</p>
<section id="terminology">
<h2>Terminology<a class="headerlink" href="#terminology" title="Link to this heading">¶</a></h2>
<p>PowerFlex groups various so-called <abbr title="storage data servers">SDS</abbr> under logical groups within a protection domain.
Those SDS are the hosts that contribute storage capacity to the PowerFlex cluster.
A <em>protection domain</em> contains storage pools, which represent a set of physical storage devices from different SDS.
LXD creates its volumes in those storage pools.</p>
<p>You can take a snapshot of any volume in PowerFlex, which will create an independent copy of the parent volume.
PowerFlex volumes get added as a drive to the respective LXD host the volume got mapped to.
In case of NVMe/TCP, the LXD host connects to one or multiple NVMe <abbr title="storage data targets">SDT</abbr> provided by PowerFlex.
Those SDT run as components on the PowerFlex storage layer.
In case of SDC, the LXD hosts don’t set up any connection by themselves.
Instead they depend on the SDC to make the volumes available on the system for consumption.</p>
</section>
<section id="powerflex-driver-in-lxd">
<h2><code class="docutils literal notranslate"><span class="pre">powerflex</span></code> driver in LXD<a class="headerlink" href="#powerflex-driver-in-lxd" title="Link to this heading">¶</a></h2>
<p>The <code class="docutils literal notranslate"><span class="pre">powerflex</span></code> driver in LXD uses PowerFlex volumes for custom storage volumes, instances and snapshots.
For storage volumes with content type <code class="docutils literal notranslate"><span class="pre">filesystem</span></code> (containers and custom file-system volumes), the <code class="docutils literal notranslate"><span class="pre">powerflex</span></code> driver uses volumes with a file system on top (see <a class="configref reference internal" href="#storage-powerflex-volume-conf:block.filesystem"><code class="docutils literal notranslate"><span class="pre">block.filesystem</span></code></a>).
By default, LXD creates thin-provisioned PowerFlex volumes.</p>
<p>LXD expects the PowerFlex protection domain and storage pool already to be set up.
Furthermore, LXD assumes that it has full control over the storage pool.
Therefore, you should never maintain any volumes that are not owned by LXD in a PowerFlex storage pool, because LXD might delete them.</p>
<p>This driver behaves differently than some of the other drivers in that it provides remote storage.
As a result and depending on the internal network, storage access might be a bit slower than for local storage.
On the other hand, using remote storage has big advantages in a cluster setup, because all cluster members have access to the same storage pools with the exact same contents, without the need to synchronize storage pools.</p>
<p>When creating a new storage pool using the <code class="docutils literal notranslate"><span class="pre">powerflex</span></code> driver in <code class="docutils literal notranslate"><span class="pre">nvme</span></code> mode, LXD tries to discover one of the SDT from the given storage pool.
Alternatively, you can specify which SDT to use with <a class="configref reference internal" href="#storage-powerflex-pool-conf:powerflex.sdt"><code class="docutils literal notranslate"><span class="pre">powerflex.sdt</span></code></a>.
LXD instructs the NVMe initiator to connect to all the other SDT when first connecting to the subsystem.</p>
<p>Due to the way copy-on-write works in PowerFlex, snapshots of any volume don’t rely on its parent.
As a result, volume snapshots are fully functional volumes themselves, and it’s possible to take additional snapshots from such volume snapshots.
This tree of dependencies is called the <em>PowerFlex vTree</em>.
Both volumes and their snapshots get added as standalone disks to the LXD host.</p>
<section id="volume-names">
<span id="storage-powerflex-volume-names"></span><h3>Volume names<a class="headerlink" href="#volume-names" title="Link to this heading">¶</a></h3>
<p>Due to a <a class="reference internal" href="#storage-powerflex-limitations"><span class="std std-ref">limitation</span></a> in PowerFlex, volume names cannot exceed 31 characters.
Therefore the driver is using the volume’s <a class="configref reference internal" href="#storage-powerflex-volume-conf:volatile.uuid"><code class="docutils literal notranslate"><span class="pre">volatile.uuid</span></code></a> to generate a fixed length volume name.
A UUID of <code class="docutils literal notranslate"><span class="pre">5a2504b0-6a6c-4849-8ee7-ddb0b674fd14</span></code> will render to the base64-encoded string <code class="docutils literal notranslate"><span class="pre">WiUEsGpsSEmO592wtnT9FA==</span></code>.</p>
<p>To be able to identify the volume types and snapshots, special identifiers are prepended to the volume names:</p>
<div class="table-wrapper colwidths-auto docutils container">
<table class="docutils align-default">
<thead>
<tr class="row-odd"><th class="head text-left"><p>Type</p></th>
<th class="head text-left"><p>Identifier</p></th>
<th class="head text-left"><p>Example</p></th>
</tr>
</thead>
<tbody>
<tr class="row-even"><td class="text-left"><p>Container</p></td>
<td class="text-left"><p><code class="docutils literal notranslate"><span class="pre">c_</span></code></p></td>
<td class="text-left"><p><code class="docutils literal notranslate"><span class="pre">c_WiUEsGpsSEmO592wtnT9FA==</span></code></p></td>
</tr>
<tr class="row-odd"><td class="text-left"><p>Virtual machine</p></td>
<td class="text-left"><p><code class="docutils literal notranslate"><span class="pre">v_</span></code></p></td>
<td class="text-left"><p><code class="docutils literal notranslate"><span class="pre">v_WiUEsGpsSEmO592wtnT9FA==.b</span></code> (block volume) and <code class="docutils literal notranslate"><span class="pre">v_WiUEsGpsSEmO592wtnT9FA==</span></code> (file system volume)</p></td>
</tr>
<tr class="row-even"><td class="text-left"><p>Image (ISO)</p></td>
<td class="text-left"><p><code class="docutils literal notranslate"><span class="pre">i_</span></code></p></td>
<td class="text-left"><p><code class="docutils literal notranslate"><span class="pre">i_WiUEsGpsSEmO592wtnT9FA==.i</span></code></p></td>
</tr>
<tr class="row-odd"><td class="text-left"><p>Custom volume</p></td>
<td class="text-left"><p><code class="docutils literal notranslate"><span class="pre">u_</span></code></p></td>
<td class="text-left"><p><code class="docutils literal notranslate"><span class="pre">u_WiUEsGpsSEmO592wtnT9FA==</span></code> (file system volume) and <code class="docutils literal notranslate"><span class="pre">u_WiUEsGpsSEmO592wtnT9FA==.b</span></code> (block volume)</p></td>
</tr>
<tr class="row-even"><td class="text-left"><p>Snapshot</p></td>
<td class="text-left"><p><code class="docutils literal notranslate"><span class="pre">s</span></code></p></td>
<td class="text-left"><p><code class="docutils literal notranslate"><span class="pre">sc_WiUEsGpsSEmO592wtnT9FA==</span></code> (container snapshot), <code class="docutils literal notranslate"><span class="pre">sv_WiUEsGpsSEmO592wtnT9FA==.b</span></code> (VM snapshot) and <code class="docutils literal notranslate"><span class="pre">su_WiUEsGpsSEmO592wtnT9FA==</span></code> (custom volume snapshot)</p></td>
</tr>
</tbody>
</table>
</div>
</section>
<section id="limitations">
<span id="storage-powerflex-limitations"></span><h3>Limitations<a class="headerlink" href="#limitations" title="Link to this heading">¶</a></h3>
<p>The <code class="docutils literal notranslate"><span class="pre">powerflex</span></code> driver has the following limitations:</p>
<dl class="simple myst">
<dt>Limit of snapshots in a single vTree</dt><dd><p>An internal limitation in the PowerFlex vTree does not allow to take more than 126 snapshots of any volume in PowerFlex.
This limit also applies to any child of any of the parent volume’s snapshots.
A single vTree can only have 126 branches.</p>
</dd>
<dt>Non-optimized image storage</dt><dd><p>Due to the limit of 126 snapshots in the vTree, the PowerFlex driver doesn’t come with support for optimized image storage.
This would limit LXD to create only 126 instances from an image.
Instead, when launching a new instance, the image’s contents get copied to the instance’s root volume.</p>
</dd>
<dt>Copying volumes</dt><dd><p>PowerFlex does not support creating a copy of the volume so that it gets its own vTree.
Therefore, LXD falls back to copying the volume on the local system.
This implicates an increased use of bandwidth due to the volume’s contents being transferred over the network twice.</p>
</dd>
<dt>Volume size constraints</dt><dd><p>In PowerFlex, the size (quota) of a volume must be in multiples of 8 GiB.
This results in the smallest possible volume size of 8 GiB.
However, if not specified otherwise, volumes are getting thin-provisioned by LXD.
PowerFlex volumes can only be increased in size.</p>
</dd>
<dt>Sharing custom volumes between instances</dt><dd><p>The PowerFlex driver “simulates” volumes with content type <code class="docutils literal notranslate"><span class="pre">filesystem</span></code> by putting a file system on top of a PowerFlex volume.
Therefore, custom storage volumes can only be assigned to a single instance at a time.</p>
</dd>
<dt>Sharing the PowerFlex storage pool between installations</dt><dd><p>Sharing the same PowerFlex storage pool between multiple LXD installations is not supported.</p>
</dd>
<dt>Recovering PowerFlex storage pools</dt><dd><p>Recovery of PowerFlex storage pools using <code class="docutils literal notranslate"><span class="pre">lxd</span> <span class="pre">recover</span></code> is not supported.</p>
</dd>
<dt>Incompatible instance images</dt><dd><p>The Ubuntu Noble Numbat image cannot be used together with the <a class="configref reference internal" href="#storage-powerflex-pool-conf:powerflex.mode"><code class="docutils literal notranslate"><span class="pre">powerflex.mode</span></code></a> set to <code class="docutils literal notranslate"><span class="pre">sdc</span></code>.
This is due to a limitation of SDC not being able to manage volumes with more than 15 partitions.</p>
</dd>
</dl>
</section>
</section>
<section id="configuration-options">
<h2>Configuration options<a class="headerlink" href="#configuration-options" title="Link to this heading">¶</a></h2>
<p>The following configuration options are available for storage pools that use the <code class="docutils literal notranslate"><span class="pre">powerflex</span></code> driver and for storage volumes in these pools.</p>
<section id="storage-pool-configuration">
<span id="storage-powerflex-pool-config"></span><h3>Storage pool configuration<a class="headerlink" href="#storage-pool-configuration" title="Link to this heading">¶</a></h3>
<div class="configoption docutils container" id="storage-powerflex-pool-conf:powerflex.domain">
<div class="basicinfo docutils container">
<span class="key"><code class="docutils literal notranslate"><span class="pre">powerflex.domain</span></code></span><span class="shortdesc"><p>Name of the PowerFlex protection domain</p>
</span><span class="anchor"><a class="reference external" href="#storage-powerflex-pool-conf:powerflex.domain"><i class="icon"><svg><use href="#svg-arrow-right"></use></svg></i></a></span></div>
<div class="details docutils container">
<div class="table-wrapper fields docutils container">
<table class="fields docutils align-default">
<tbody>
<tr class="row-odd"><td><strong>Key: </strong></td>
<td><code class="docutils literal notranslate"><span class="pre">powerflex.domain</span></code></td>
</tr>
<tr class="row-even"><td><strong>Type: </strong></td>
<td><span class="ignoreP"><p>string</p>
</span></td>
</tr>
<tr class="row-odd"><td><strong>Scope: </strong></td>
<td><span class="ignoreP"><p>global</p>
</span></td>
</tr>
</tbody>
</table>
</div>
<p>This option is required only if <a class="configref reference internal" href="#storage-powerflex-pool-conf:powerflex.pool"><code class="docutils literal notranslate"><span class="pre">powerflex.pool</span></code></a> is specified using its name.</p>
</div>
</div>
<div class="configoption docutils container" id="storage-powerflex-pool-conf:powerflex.gateway">
<div class="basicinfo docutils container">
<span class="key"><code class="docutils literal notranslate"><span class="pre">powerflex.gateway</span></code></span><span class="shortdesc"><p>Address of the PowerFlex Gateway</p>
</span><span class="anchor"><a class="reference external" href="#storage-powerflex-pool-conf:powerflex.gateway"><i class="icon"><svg><use href="#svg-arrow-right"></use></svg></i></a></span></div>
<div class="details docutils container">
<div class="table-wrapper fields docutils container">
<table class="fields docutils align-default">
<tbody>
<tr class="row-odd"><td><strong>Key: </strong></td>
<td><code class="docutils literal notranslate"><span class="pre">powerflex.gateway</span></code></td>
</tr>
<tr class="row-even"><td><strong>Type: </strong></td>
<td><span class="ignoreP"><p>string</p>
</span></td>
</tr>
<tr class="row-odd"><td><strong>Scope: </strong></td>
<td><span class="ignoreP"><p>global</p>
</span></td>
</tr>
</tbody>
</table>
</div>
</div>
</div>
<div class="configoption docutils container" id="storage-powerflex-pool-conf:powerflex.gateway.verify">
<div class="basicinfo docutils container">
<span class="key"><code class="docutils literal notranslate"><span class="pre">powerflex.gateway.verify</span></code></span><span class="shortdesc"><p>Whether to verify the PowerFlex Gateway’s certificate</p>
</span><span class="anchor"><a class="reference external" href="#storage-powerflex-pool-conf:powerflex.gateway.verify"><i class="icon"><svg><use href="#svg-arrow-right"></use></svg></i></a></span></div>
<div class="details docutils container">
<div class="table-wrapper fields docutils container">
<table class="fields docutils align-default">
<tbody>
<tr class="row-odd"><td><strong>Key: </strong></td>
<td><code class="docutils literal notranslate"><span class="pre">powerflex.gateway.verify</span></code></td>
</tr>
<tr class="row-even"><td><strong>Type: </strong></td>
<td><span class="ignoreP"><p>bool</p>
</span></td>
</tr>
<tr class="row-odd"><td><strong>Default: </strong></td>
<td><span class="ignoreP"><p><code class="docutils literal notranslate"><span class="pre">true</span></code></p>
</span></td>
</tr>
<tr class="row-even"><td><strong>Scope: </strong></td>
<td><span class="ignoreP"><p>global</p>
</span></td>
</tr>
</tbody>
</table>
</div>
</div>
</div>
<div class="configoption docutils container" id="storage-powerflex-pool-conf:powerflex.mode">
<div class="basicinfo docutils container">
<span class="key"><code class="docutils literal notranslate"><span class="pre">powerflex.mode</span></code></span><span class="shortdesc"><p>How volumes are mapped to the local server</p>
</span><span class="anchor"><a class="reference external" href="#storage-powerflex-pool-conf:powerflex.mode"><i class="icon"><svg><use href="#svg-arrow-right"></use></svg></i></a></span></div>
<div class="details docutils container">
<div class="table-wrapper fields docutils container">
<table class="fields docutils align-default">
<tbody>
<tr class="row-odd"><td><strong>Key: </strong></td>
<td><code class="docutils literal notranslate"><span class="pre">powerflex.mode</span></code></td>
</tr>
<tr class="row-even"><td><strong>Type: </strong></td>
<td><span class="ignoreP"><p>string</p>
</span></td>
</tr>
<tr class="row-odd"><td><strong>Default: </strong></td>
<td><span class="ignoreP"><p>the discovered mode</p>
</span></td>
</tr>
<tr class="row-even"><td><strong>Scope: </strong></td>
<td><span class="ignoreP"><p>global</p>
</span></td>
</tr>
</tbody>
</table>
</div>
<p>The mode gets discovered automatically if the system provides the necessary kernel modules.
This can be either <code class="docutils literal notranslate"><span class="pre">nvme</span></code> or <code class="docutils literal notranslate"><span class="pre">sdc</span></code>.</p>
</div>
</div>
<div class="configoption docutils container" id="storage-powerflex-pool-conf:powerflex.pool">
<div class="basicinfo docutils container">
<span class="key"><code class="docutils literal notranslate"><span class="pre">powerflex.pool</span></code></span><span class="shortdesc"><p>ID of the PowerFlex storage pool</p>
</span><span class="anchor"><a class="reference external" href="#storage-powerflex-pool-conf:powerflex.pool"><i class="icon"><svg><use href="#svg-arrow-right"></use></svg></i></a></span></div>
<div class="details docutils container">
<div class="table-wrapper fields docutils container">
<table class="fields docutils align-default">
<tbody>
<tr class="row-odd"><td><strong>Key: </strong></td>
<td><code class="docutils literal notranslate"><span class="pre">powerflex.pool</span></code></td>
</tr>
<tr class="row-even"><td><strong>Type: </strong></td>
<td><span class="ignoreP"><p>string</p>
</span></td>
</tr>
<tr class="row-odd"><td><strong>Scope: </strong></td>
<td><span class="ignoreP"><p>global</p>
</span></td>
</tr>
</tbody>
</table>
</div>
<p>If you want to specify the storage pool via its name, also set <a class="configref reference internal" href="#storage-powerflex-pool-conf:powerflex.domain"><code class="docutils literal notranslate"><span class="pre">powerflex.domain</span></code></a>.</p>
</div>
</div>
<div class="configoption docutils container" id="storage-powerflex-pool-conf:powerflex.sdt">
<div class="basicinfo docutils container">
<span class="key"><code class="docutils literal notranslate"><span class="pre">powerflex.sdt</span></code></span><span class="shortdesc"><p>Comma separated list of PowerFlex NVMe/TCP SDTs</p>
</span><span class="anchor"><a class="reference external" href="#storage-powerflex-pool-conf:powerflex.sdt"><i class="icon"><svg><use href="#svg-arrow-right"></use></svg></i></a></span></div>
<div class="details docutils container">
<div class="table-wrapper fields docutils container">
<table class="fields docutils align-default">
<tbody>
<tr class="row-odd"><td><strong>Key: </strong></td>
<td><code class="docutils literal notranslate"><span class="pre">powerflex.sdt</span></code></td>
</tr>
<tr class="row-even"><td><strong>Type: </strong></td>
<td><span class="ignoreP"><p>string</p>
</span></td>
</tr>
<tr class="row-odd"><td><strong>Scope: </strong></td>
<td><span class="ignoreP"><p>global</p>
</span></td>
</tr>
</tbody>
</table>
</div>
</div>
</div>
<div class="configoption docutils container" id="storage-powerflex-pool-conf:powerflex.snapshot_copy">
<div class="basicinfo docutils container">
<span class="key"><code class="docutils literal notranslate"><span class="pre">powerflex.snapshot_copy</span></code></span><span class="shortdesc"><p>Whether to use sparse snapshots for copies</p>
</span><span class="anchor"><a class="reference external" href="#storage-powerflex-pool-conf:powerflex.snapshot_copy"><i class="icon"><svg><use href="#svg-arrow-right"></use></svg></i></a></span></div>
<div class="details docutils container">
<div class="table-wrapper fields docutils container">
<table class="fields docutils align-default">
<tbody>
<tr class="row-odd"><td><strong>Key: </strong></td>
<td><code class="docutils literal notranslate"><span class="pre">powerflex.snapshot_copy</span></code></td>
</tr>
<tr class="row-even"><td><strong>Type: </strong></td>
<td><span class="ignoreP"><p>bool</p>
</span></td>
</tr>
<tr class="row-odd"><td><strong>Default: </strong></td>
<td><span class="ignoreP"><p><code class="docutils literal notranslate"><span class="pre">false</span></code></p>
</span></td>
</tr>
<tr class="row-even"><td><strong>Scope: </strong></td>
<td><span class="ignoreP"><p>global</p>
</span></td>
</tr>
</tbody>
</table>
</div>
<p>If this option is set to <code class="docutils literal notranslate"><span class="pre">true</span></code>, PowerFlex makes a sparse snapshot when copying an instance or custom volume.
See <a class="reference internal" href="#storage-powerflex-limitations"><span class="std std-ref">Limitations</span></a> for more information.</p>
</div>
</div>
<div class="configoption docutils container" id="storage-powerflex-pool-conf:powerflex.user.name">
<div class="basicinfo docutils container">
<span class="key"><code class="docutils literal notranslate"><span class="pre">powerflex.user.name</span></code></span><span class="shortdesc"><p>User for PowerFlex Gateway authentication</p>
</span><span class="anchor"><a class="reference external" href="#storage-powerflex-pool-conf:powerflex.user.name"><i class="icon"><svg><use href="#svg-arrow-right"></use></svg></i></a></span></div>
<div class="details docutils container">
<div class="table-wrapper fields docutils container">
<table class="fields docutils align-default">
<tbody>
<tr class="row-odd"><td><strong>Key: </strong></td>
<td><code class="docutils literal notranslate"><span class="pre">powerflex.user.name</span></code></td>
</tr>
<tr class="row-even"><td><strong>Type: </strong></td>
<td><span class="ignoreP"><p>string</p>
</span></td>
</tr>
<tr class="row-odd"><td><strong>Default: </strong></td>
<td><span class="ignoreP"><p><code class="docutils literal notranslate"><span class="pre">admin</span></code></p>
</span></td>
</tr>
<tr class="row-even"><td><strong>Scope: </strong></td>
<td><span class="ignoreP"><p>global</p>
</span></td>
</tr>
</tbody>
</table>
</div>
<p>Must have at least SystemAdmin role to give LXD full control over managed storage pools.</p>
</div>
</div>
<div class="configoption docutils container" id="storage-powerflex-pool-conf:powerflex.user.password">
<div class="basicinfo docutils container">
<span class="key"><code class="docutils literal notranslate"><span class="pre">powerflex.user.password</span></code></span><span class="shortdesc"><p>Password for PowerFlex Gateway authentication</p>
</span><span class="anchor"><a class="reference external" href="#storage-powerflex-pool-conf:powerflex.user.password"><i class="icon"><svg><use href="#svg-arrow-right"></use></svg></i></a></span></div>
<div class="details docutils container">
<div class="table-wrapper fields docutils container">
<table class="fields docutils align-default">
<tbody>
<tr class="row-odd"><td><strong>Key: </strong></td>
<td><code class="docutils literal notranslate"><span class="pre">powerflex.user.password</span></code></td>
</tr>
<tr class="row-even"><td><strong>Type: </strong></td>
<td><span class="ignoreP"><p>string</p>
</span></td>
</tr>
<tr class="row-odd"><td><strong>Scope: </strong></td>
<td><span class="ignoreP"><p>global</p>
</span></td>
</tr>
</tbody>
</table>
</div>
</div>
</div>
<div class="configoption docutils container" id="storage-powerflex-pool-conf:rsync.bwlimit">
<div class="basicinfo docutils container">
<span class="key"><code class="docutils literal notranslate"><span class="pre">rsync.bwlimit</span></code></span><span class="shortdesc"><p>Upper limit on the socket I/O for <code class="docutils literal notranslate"><span class="pre">rsync</span></code></p>
</span><span class="anchor"><a class="reference external" href="#storage-powerflex-pool-conf:rsync.bwlimit"><i class="icon"><svg><use href="#svg-arrow-right"></use></svg></i></a></span></div>
<div class="details docutils container">
<div class="table-wrapper fields docutils container">
<table class="fields docutils align-default">
<tbody>
<tr class="row-odd"><td><strong>Key: </strong></td>
<td><code class="docutils literal notranslate"><span class="pre">rsync.bwlimit</span></code></td>
</tr>
<tr class="row-even"><td><strong>Type: </strong></td>
<td><span class="ignoreP"><p>string</p>
</span></td>
</tr>
<tr class="row-odd"><td><strong>Default: </strong></td>
<td><span class="ignoreP"><p><code class="docutils literal notranslate"><span class="pre">0</span></code> (no limit)</p>
</span></td>
</tr>
<tr class="row-even"><td><strong>Scope: </strong></td>
<td><span class="ignoreP"><p>global</p>
</span></td>
</tr>
</tbody>
</table>
</div>
<p>When <code class="docutils literal notranslate"><span class="pre">rsync</span></code> must be used to transfer storage entities, this option specifies the upper limit
to be placed on the socket I/O.</p>
</div>
</div>
<div class="configoption docutils container" id="storage-powerflex-pool-conf:rsync.compression">
<div class="basicinfo docutils container">
<span class="key"><code class="docutils literal notranslate"><span class="pre">rsync.compression</span></code></span><span class="shortdesc"><p>Whether to use compression while migrating storage pools</p>
</span><span class="anchor"><a class="reference external" href="#storage-powerflex-pool-conf:rsync.compression"><i class="icon"><svg><use href="#svg-arrow-right"></use></svg></i></a></span></div>
<div class="details docutils container">
<div class="table-wrapper fields docutils container">
<table class="fields docutils align-default">
<tbody>
<tr class="row-odd"><td><strong>Key: </strong></td>
<td><code class="docutils literal notranslate"><span class="pre">rsync.compression</span></code></td>
</tr>
<tr class="row-even"><td><strong>Type: </strong></td>
<td><span class="ignoreP"><p>bool</p>
</span></td>
</tr>
<tr class="row-odd"><td><strong>Default: </strong></td>
<td><span class="ignoreP"><p><code class="docutils literal notranslate"><span class="pre">true</span></code></p>
</span></td>
</tr>
<tr class="row-even"><td><strong>Scope: </strong></td>
<td><span class="ignoreP"><p>global</p>
</span></td>
</tr>
</tbody>
</table>
</div>
</div>
</div>
<div class="configoption docutils container" id="storage-powerflex-pool-conf:volume.size">
<div class="basicinfo docutils container">
<span class="key"><code class="docutils literal notranslate"><span class="pre">volume.size</span></code></span><span class="shortdesc"><p>Size/quota of the storage volume</p>
</span><span class="anchor"><a class="reference external" href="#storage-powerflex-pool-conf:volume.size"><i class="icon"><svg><use href="#svg-arrow-right"></use></svg></i></a></span></div>
<div class="details docutils container">
<div class="table-wrapper fields docutils container">
<table class="fields docutils align-default">
<tbody>
<tr class="row-odd"><td><strong>Key: </strong></td>
<td><code class="docutils literal notranslate"><span class="pre">volume.size</span></code></td>
</tr>
<tr class="row-even"><td><strong>Type: </strong></td>
<td><span class="ignoreP"><p>string</p>
</span></td>
</tr>
<tr class="row-odd"><td><strong>Default: </strong></td>
<td><span class="ignoreP"><p><code class="docutils literal notranslate"><span class="pre">8GiB</span></code></p>
</span></td>
</tr>
<tr class="row-even"><td><strong>Scope: </strong></td>
<td><span class="ignoreP"><p>global</p>
</span></td>
</tr>
</tbody>
</table>
</div>
<p>The size must be in multiples of 8 GiB.
See <a class="reference internal" href="#storage-powerflex-limitations"><span class="std std-ref">Limitations</span></a> for more information.</p>
</div>
</div>
<div class="admonition tip">
<p class="admonition-title">Tip</p>
<p>In addition to these configurations, you can also set default values for the storage volume configurations. See <a class="reference internal" href="../../howto/storage_volumes/#storage-configure-vol-default"><span class="std std-ref">Configure default values for storage volumes</span></a>.</p>
</div>
</section>
<section id="storage-volume-configuration">
<span id="storage-powerflex-vol-config"></span><h3>Storage volume configuration<a class="headerlink" href="#storage-volume-configuration" title="Link to this heading">¶</a></h3>
<div class="configoption docutils container" id="storage-powerflex-volume-conf:block.filesystem">
<div class="basicinfo docutils container">
<span class="key"><code class="docutils literal notranslate"><span class="pre">block.filesystem</span></code></span><span class="shortdesc"><p>File system of the storage volume</p>
</span><span class="anchor"><a class="reference external" href="#storage-powerflex-volume-conf:block.filesystem"><i class="icon"><svg><use href="#svg-arrow-right"></use></svg></i></a></span></div>
<div class="details docutils container">
<div class="table-wrapper fields docutils container">
<table class="fields docutils align-default">
<tbody>
<tr class="row-odd"><td><strong>Key: </strong></td>
<td><code class="docutils literal notranslate"><span class="pre">block.filesystem</span></code></td>
</tr>
<tr class="row-even"><td><strong>Type: </strong></td>
<td><span class="ignoreP"><p>string</p>
</span></td>
</tr>
<tr class="row-odd"><td><strong>Default: </strong></td>
<td><span class="ignoreP"><p>same as <code class="docutils literal notranslate"><span class="pre">volume.block.filesystem</span></code></p>
</span></td>
</tr>
<tr class="row-even"><td><strong>Condition: </strong></td>
<td><span class="ignoreP"><p>block-based volume with content type <code class="docutils literal notranslate"><span class="pre">filesystem</span></code></p>
</span></td>
</tr>
<tr class="row-odd"><td><strong>Scope: </strong></td>
<td><span class="ignoreP"><p>global</p>
</span></td>
</tr>
</tbody>
</table>
</div>
<p>Valid options are: <code class="docutils literal notranslate"><span class="pre">btrfs</span></code>, <code class="docutils literal notranslate"><span class="pre">ext4</span></code>, <code class="docutils literal notranslate"><span class="pre">xfs</span></code>
If not set, <code class="docutils literal notranslate"><span class="pre">ext4</span></code> is assumed.</p>
</div>
</div>
<div class="configoption docutils container" id="storage-powerflex-volume-conf:block.mount_options">
<div class="basicinfo docutils container">
<span class="key"><code class="docutils literal notranslate"><span class="pre">block.mount_options</span></code></span><span class="shortdesc"><p>Mount options for block-backed file system volumes</p>
</span><span class="anchor"><a class="reference external" href="#storage-powerflex-volume-conf:block.mount_options"><i class="icon"><svg><use href="#svg-arrow-right"></use></svg></i></a></span></div>
<div class="details docutils container">
<div class="table-wrapper fields docutils container">
<table class="fields docutils align-default">
<tbody>
<tr class="row-odd"><td><strong>Key: </strong></td>
<td><code class="docutils literal notranslate"><span class="pre">block.mount_options</span></code></td>
</tr>
<tr class="row-even"><td><strong>Type: </strong></td>
<td><span class="ignoreP"><p>string</p>
</span></td>
</tr>
<tr class="row-odd"><td><strong>Default: </strong></td>
<td><span class="ignoreP"><p>same as <code class="docutils literal notranslate"><span class="pre">volume.block.mount_options</span></code></p>
</span></td>
</tr>
<tr class="row-even"><td><strong>Condition: </strong></td>
<td><span class="ignoreP"><p>block-based volume with content type <code class="docutils literal notranslate"><span class="pre">filesystem</span></code></p>
</span></td>
</tr>
<tr class="row-odd"><td><strong>Scope: </strong></td>
<td><span class="ignoreP"><p>global</p>
</span></td>
</tr>
</tbody>
</table>
</div>
</div>
</div>
<div class="configoption docutils container" id="storage-powerflex-volume-conf:block.type">
<div class="basicinfo docutils container">
<span class="key"><code class="docutils literal notranslate"><span class="pre">block.type</span></code></span><span class="shortdesc"><p>Whether to create a <code class="docutils literal notranslate"><span class="pre">thin</span></code> or <code class="docutils literal notranslate"><span class="pre">thick</span></code> provisioned volume</p>
</span><span class="anchor"><a class="reference external" href="#storage-powerflex-volume-conf:block.type"><i class="icon"><svg><use href="#svg-arrow-right"></use></svg></i></a></span></div>
<div class="details docutils container">
<div class="table-wrapper fields docutils container">
<table class="fields docutils align-default">
<tbody>
<tr class="row-odd"><td><strong>Key: </strong></td>
<td><code class="docutils literal notranslate"><span class="pre">block.type</span></code></td>
</tr>
<tr class="row-even"><td><strong>Type: </strong></td>
<td><span class="ignoreP"><p>string</p>
</span></td>
</tr>
<tr class="row-odd"><td><strong>Default: </strong></td>
<td><span class="ignoreP"><p>same as <code class="docutils literal notranslate"><span class="pre">volume.block.type</span></code> or <code class="docutils literal notranslate"><span class="pre">thick</span></code></p>
</span></td>
</tr>
<tr class="row-even"><td><strong>Scope: </strong></td>
<td><span class="ignoreP"><p>global</p>
</span></td>
</tr>
</tbody>
</table>
</div>
</div>
</div>
<div class="configoption docutils container" id="storage-powerflex-volume-conf:security.shared">
<div class="basicinfo docutils container">
<span class="key"><code class="docutils literal notranslate"><span class="pre">security.shared</span></code></span><span class="shortdesc"><p>Enable volume sharing</p>
</span><span class="anchor"><a class="reference external" href="#storage-powerflex-volume-conf:security.shared"><i class="icon"><svg><use href="#svg-arrow-right"></use></svg></i></a></span></div>
<div class="details docutils container">
<div class="table-wrapper fields docutils container">
<table class="fields docutils align-default">
<tbody>
<tr class="row-odd"><td><strong>Key: </strong></td>
<td><code class="docutils literal notranslate"><span class="pre">security.shared</span></code></td>
</tr>
<tr class="row-even"><td><strong>Type: </strong></td>
<td><span class="ignoreP"><p>bool</p>
</span></td>
</tr>
<tr class="row-odd"><td><strong>Default: </strong></td>
<td><span class="ignoreP"><p>same as <code class="docutils literal notranslate"><span class="pre">volume.security.shared</span></code> or <code class="docutils literal notranslate"><span class="pre">false</span></code></p>
</span></td>
</tr>
<tr class="row-even"><td><strong>Condition: </strong></td>
<td><span class="ignoreP"><p>virtual-machine or custom block volume</p>
</span></td>
</tr>
<tr class="row-odd"><td><strong>Scope: </strong></td>
<td><span class="ignoreP"><p>global</p>
</span></td>
</tr>
</tbody>
</table>
</div>
<p>Enabling this option allows sharing the volume across multiple instances despite the possibility of data loss.</p>
</div>
</div>
<div class="configoption docutils container" id="storage-powerflex-volume-conf:security.shifted">
<div class="basicinfo docutils container">
<span class="key"><code class="docutils literal notranslate"><span class="pre">security.shifted</span></code></span><span class="shortdesc"><p>Enable ID shifting overlay</p>
</span><span class="anchor"><a class="reference external" href="#storage-powerflex-volume-conf:security.shifted"><i class="icon"><svg><use href="#svg-arrow-right"></use></svg></i></a></span></div>
<div class="details docutils container">
<div class="table-wrapper fields docutils container">
<table class="fields docutils align-default">
<tbody>
<tr class="row-odd"><td><strong>Key: </strong></td>
<td><code class="docutils literal notranslate"><span class="pre">security.shifted</span></code></td>
</tr>
<tr class="row-even"><td><strong>Type: </strong></td>
<td><span class="ignoreP"><p>bool</p>
</span></td>
</tr>
<tr class="row-odd"><td><strong>Default: </strong></td>
<td><span class="ignoreP"><p>same as <code class="docutils literal notranslate"><span class="pre">volume.security.shifted</span></code> or <code class="docutils literal notranslate"><span class="pre">false</span></code></p>
</span></td>
</tr>
<tr class="row-even"><td><strong>Condition: </strong></td>
<td><span class="ignoreP"><p>custom volume</p>
</span></td>
</tr>
<tr class="row-odd"><td><strong>Scope: </strong></td>
<td><span class="ignoreP"><p>global</p>
</span></td>
</tr>
</tbody>
</table>
</div>
<p>Enabling this option allows attaching the volume to multiple isolated instances.</p>
</div>
</div>
<div class="configoption docutils container" id="storage-powerflex-volume-conf:security.unmapped">
<div class="basicinfo docutils container">
<span class="key"><code class="docutils literal notranslate"><span class="pre">security.unmapped</span></code></span><span class="shortdesc"><p>Disable ID mapping for the volume</p>
</span><span class="anchor"><a class="reference external" href="#storage-powerflex-volume-conf:security.unmapped"><i class="icon"><svg><use href="#svg-arrow-right"></use></svg></i></a></span></div>
<div class="details docutils container">
<div class="table-wrapper fields docutils container">
<table class="fields docutils align-default">
<tbody>
<tr class="row-odd"><td><strong>Key: </strong></td>
<td><code class="docutils literal notranslate"><span class="pre">security.unmapped</span></code></td>
</tr>
<tr class="row-even"><td><strong>Type: </strong></td>
<td><span class="ignoreP"><p>bool</p>
</span></td>
</tr>
<tr class="row-odd"><td><strong>Default: </strong></td>
<td><span class="ignoreP"><p>same as <code class="docutils literal notranslate"><span class="pre">volume.security.unmappped</span></code> or <code class="docutils literal notranslate"><span class="pre">false</span></code></p>
</span></td>
</tr>
<tr class="row-even"><td><strong>Condition: </strong></td>
<td><span class="ignoreP"><p>custom volume</p>
</span></td>
</tr>
<tr class="row-odd"><td><strong>Scope: </strong></td>
<td><span class="ignoreP"><p>global</p>
</span></td>
</tr>
</tbody>
</table>
</div>
</div>
</div>
<div class="configoption docutils container" id="storage-powerflex-volume-conf:size">
<div class="basicinfo docutils container">
<span class="key"><code class="docutils literal notranslate"><span class="pre">size</span></code></span><span class="shortdesc"><p>Size/quota of the storage volume</p>
</span><span class="anchor"><a class="reference external" href="#storage-powerflex-volume-conf:size"><i class="icon"><svg><use href="#svg-arrow-right"></use></svg></i></a></span></div>
<div class="details docutils container">
<div class="table-wrapper fields docutils container">
<table class="fields docutils align-default">
<tbody>
<tr class="row-odd"><td><strong>Key: </strong></td>
<td><code class="docutils literal notranslate"><span class="pre">size</span></code></td>
</tr>
<tr class="row-even"><td><strong>Type: </strong></td>
<td><span class="ignoreP"><p>string</p>
</span></td>
</tr>
<tr class="row-odd"><td><strong>Default: </strong></td>
<td><span class="ignoreP"><p>same as <code class="docutils literal notranslate"><span class="pre">volume.size</span></code></p>
</span></td>
</tr>
<tr class="row-even"><td><strong>Scope: </strong></td>
<td><span class="ignoreP"><p>global</p>
</span></td>
</tr>
</tbody>
</table>
</div>
<p>The size must be in multiples of 8 GiB.
See <a class="reference internal" href="#storage-powerflex-limitations"><span class="std std-ref">Limitations</span></a> for more information.</p>
</div>
</div>
<div class="configoption docutils container" id="storage-powerflex-volume-conf:snapshots.expiry">
<div class="basicinfo docutils container">
<span class="key"><code class="docutils literal notranslate"><span class="pre">snapshots.expiry</span></code></span><span class="shortdesc"><p>When snapshots are to be deleted</p>
</span><span class="anchor"><a class="reference external" href="#storage-powerflex-volume-conf:snapshots.expiry"><i class="icon"><svg><use href="#svg-arrow-right"></use></svg></i></a></span></div>
<div class="details docutils container">
<div class="table-wrapper fields docutils container">
<table class="fields docutils align-default">
<tbody>
<tr class="row-odd"><td><strong>Key: </strong></td>
<td><code class="docutils literal notranslate"><span class="pre">snapshots.expiry</span></code></td>
</tr>
<tr class="row-even"><td><strong>Type: </strong></td>
<td><span class="ignoreP"><p>string</p>
</span></td>
</tr>
<tr class="row-odd"><td><strong>Default: </strong></td>
<td><span class="ignoreP"><p>same as <code class="docutils literal notranslate"><span class="pre">volume.snapshots.expiry</span></code></p>
</span></td>
</tr>
<tr class="row-even"><td><strong>Condition: </strong></td>
<td><span class="ignoreP"><p>custom volume</p>
</span></td>
</tr>
<tr class="row-odd"><td><strong>Scope: </strong></td>
<td><span class="ignoreP"><p>global</p>
</span></td>
</tr>
</tbody>
</table>
</div>
<p>Specify an expression like <code class="docutils literal notranslate"><span class="pre">1M</span> <span class="pre">2H</span> <span class="pre">3d</span> <span class="pre">4w</span> <span class="pre">5m</span> <span class="pre">6y</span></code>.</p>
</div>
</div>
<div class="configoption docutils container" id="storage-powerflex-volume-conf:snapshots.pattern">
<div class="basicinfo docutils container">
<span class="key"><code class="docutils literal notranslate"><span class="pre">snapshots.pattern</span></code></span><span class="shortdesc"><p>Template for the snapshot name</p>
</span><span class="anchor"><a class="reference external" href="#storage-powerflex-volume-conf:snapshots.pattern"><i class="icon"><svg><use href="#svg-arrow-right"></use></svg></i></a></span></div>
<div class="details docutils container">
<div class="table-wrapper fields docutils container">
<table class="fields docutils align-default">
<tbody>
<tr class="row-odd"><td><strong>Key: </strong></td>
<td><code class="docutils literal notranslate"><span class="pre">snapshots.pattern</span></code></td>
</tr>
<tr class="row-even"><td><strong>Type: </strong></td>
<td><span class="ignoreP"><p>string</p>
</span></td>
</tr>
<tr class="row-odd"><td><strong>Default: </strong></td>
<td><span class="ignoreP"><p>same as <code class="docutils literal notranslate"><span class="pre">volume.snapshots.pattern</span></code> or <code class="docutils literal notranslate"><span class="pre">snap%d</span></code></p>
</span></td>
</tr>
<tr class="row-even"><td><strong>Condition: </strong></td>
<td><span class="ignoreP"><p>custom volume</p>
</span></td>
</tr>
<tr class="row-odd"><td><strong>Scope: </strong></td>
<td><span class="ignoreP"><p>global</p>
</span></td>
</tr>
</tbody>
</table>
</div>
<p>You can specify a naming template that is used for scheduled snapshots and unnamed snapshots.</p>
<p>The <code class="docutils literal notranslate"><span class="pre">snapshots.pattern</span></code> option takes a Pongo2 template string to format the snapshot name.</p>
<p>To add a time stamp to the snapshot name, use the Pongo2 context variable <code class="docutils literal notranslate"><span class="pre">creation_date</span></code>.
Make sure to format the date in your template string to avoid forbidden characters in the snapshot name.
For example, set <code class="docutils literal notranslate"><span class="pre">snapshots.pattern</span></code> to <code class="docutils literal notranslate"><span class="pre">{{</span> <span class="pre">creation_date|date:'2006-01-02_15-04-05'</span> <span class="pre">}}</span></code> to name the snapshots after their time of creation, down to the precision of a second.</p>
<p>Another way to avoid name collisions is to use the placeholder <code class="docutils literal notranslate"><span class="pre">%d</span></code> in the pattern.
For the first snapshot, the placeholder is replaced with <code class="docutils literal notranslate"><span class="pre">0</span></code>.
For subsequent snapshots, the existing snapshot names are taken into account to find the highest number at the placeholder’s position.
This number is then incremented by one for the new name.</p>
</div>
</div>
<div class="configoption docutils container" id="storage-powerflex-volume-conf:snapshots.schedule">
<div class="basicinfo docutils container">
<span class="key"><code class="docutils literal notranslate"><span class="pre">snapshots.schedule</span></code></span><span class="shortdesc"><p>Schedule for automatic volume snapshots</p>
</span><span class="anchor"><a class="reference external" href="#storage-powerflex-volume-conf:snapshots.schedule"><i class="icon"><svg><use href="#svg-arrow-right"></use></svg></i></a></span></div>
<div class="details docutils container">
<div class="table-wrapper fields docutils container">
<table class="fields docutils align-default">
<tbody>
<tr class="row-odd"><td><strong>Key: </strong></td>
<td><code class="docutils literal notranslate"><span class="pre">snapshots.schedule</span></code></td>
</tr>
<tr class="row-even"><td><strong>Type: </strong></td>
<td><span class="ignoreP"><p>string</p>
</span></td>
</tr>
<tr class="row-odd"><td><strong>Default: </strong></td>
<td><span class="ignoreP"><p>same as <code class="docutils literal notranslate"><span class="pre">snapshots.schedule</span></code></p>
</span></td>
</tr>
<tr class="row-even"><td><strong>Condition: </strong></td>
<td><span class="ignoreP"><p>custom volume</p>
</span></td>
</tr>
<tr class="row-odd"><td><strong>Scope: </strong></td>
<td><span class="ignoreP"><p>global</p>
</span></td>
</tr>
</tbody>
</table>
</div>
<p>Specify either a cron expression (<code class="docutils literal notranslate"><span class="pre">&lt;minute&gt;</span> <span class="pre">&lt;hour&gt;</span> <span class="pre">&lt;dom&gt;</span> <span class="pre">&lt;month&gt;</span> <span class="pre">&lt;dow&gt;</span></code>), a comma-separated list of schedule aliases (<code class="docutils literal notranslate"><span class="pre">&#64;hourly</span></code>, <code class="docutils literal notranslate"><span class="pre">&#64;daily</span></code>, <code class="docutils literal notranslate"><span class="pre">&#64;midnight</span></code>, <code class="docutils literal notranslate"><span class="pre">&#64;weekly</span></code>, <code class="docutils literal notranslate"><span class="pre">&#64;monthly</span></code>, <code class="docutils literal notranslate"><span class="pre">&#64;annually</span></code>, <code class="docutils literal notranslate"><span class="pre">&#64;yearly</span></code>), or leave empty to disable automatic snapshots (the default).</p>
</div>
</div>
<div class="configoption docutils container" id="storage-powerflex-volume-conf:volatile.devlxd.owner">
<div class="basicinfo docutils container">
<span class="key"><code class="docutils literal notranslate"><span class="pre">volatile.devlxd.owner</span></code></span><span class="shortdesc"><p>The ID of the DevLXD identity which owns the volume</p>
</span><span class="anchor"><a class="reference external" href="#storage-powerflex-volume-conf:volatile.devlxd.owner"><i class="icon"><svg><use href="#svg-arrow-right"></use></svg></i></a></span></div>
<div class="details docutils container">
<div class="table-wrapper fields docutils container">
<table class="fields docutils align-default">
<tbody>
<tr class="row-odd"><td><strong>Key: </strong></td>
<td><code class="docutils literal notranslate"><span class="pre">volatile.devlxd.owner</span></code></td>
</tr>
<tr class="row-even"><td><strong>Type: </strong></td>
<td><span class="ignoreP"><p>string</p>
</span></td>
</tr>
<tr class="row-odd"><td><strong>Default: </strong></td>
<td><span class="ignoreP"><p>DevLXD owner identity ID</p>
</span></td>
</tr>
<tr class="row-even"><td><strong>Scope: </strong></td>
<td><span class="ignoreP"><p>global</p>
</span></td>
</tr>
</tbody>
</table>
</div>
</div>
</div>
<div class="configoption docutils container" id="storage-powerflex-volume-conf:volatile.idmap.last">
<div class="basicinfo docutils container">
<span class="key"><code class="docutils literal notranslate"><span class="pre">volatile.idmap.last</span></code></span><span class="shortdesc"><p>JSON-serialized UID/GID map that has been applied to the volume</p>
</span><span class="anchor"><a class="reference external" href="#storage-powerflex-volume-conf:volatile.idmap.last"><i class="icon"><svg><use href="#svg-arrow-right"></use></svg></i></a></span></div>
<div class="details docutils container">
<div class="table-wrapper fields docutils container">
<table class="fields docutils align-default">
<tbody>
<tr class="row-odd"><td><strong>Key: </strong></td>
<td><code class="docutils literal notranslate"><span class="pre">volatile.idmap.last</span></code></td>
</tr>
<tr class="row-even"><td><strong>Type: </strong></td>
<td><span class="ignoreP"><p>string</p>
</span></td>
</tr>
<tr class="row-odd"><td><strong>Condition: </strong></td>
<td><span class="ignoreP"><p>filesystem</p>
</span></td>
</tr>
</tbody>
</table>
</div>
</div>
</div>
<div class="configoption docutils container" id="storage-powerflex-volume-conf:volatile.idmap.next">
<div class="basicinfo docutils container">
<span class="key"><code class="docutils literal notranslate"><span class="pre">volatile.idmap.next</span></code></span><span class="shortdesc"><p>JSON-serialized UID/GID map that has been applied to the volume</p>
</span><span class="anchor"><a class="reference external" href="#storage-powerflex-volume-conf:volatile.idmap.next"><i class="icon"><svg><use href="#svg-arrow-right"></use></svg></i></a></span></div>
<div class="details docutils container">
<div class="table-wrapper fields docutils container">
<table class="fields docutils align-default">
<tbody>
<tr class="row-odd"><td><strong>Key: </strong></td>
<td><code class="docutils literal notranslate"><span class="pre">volatile.idmap.next</span></code></td>
</tr>
<tr class="row-even"><td><strong>Type: </strong></td>
<td><span class="ignoreP"><p>string</p>
</span></td>
</tr>
<tr class="row-odd"><td><strong>Condition: </strong></td>
<td><span class="ignoreP"><p>filesystem</p>
</span></td>
</tr>
</tbody>
</table>
</div>
</div>
</div>
<div class="configoption docutils container" id="storage-powerflex-volume-conf:volatile.uuid">
<div class="basicinfo docutils container">
<span class="key"><code class="docutils literal notranslate"><span class="pre">volatile.uuid</span></code></span><span class="shortdesc"><p>The volume’s UUID</p>
</span><span class="anchor"><a class="reference external" href="#storage-powerflex-volume-conf:volatile.uuid"><i class="icon"><svg><use href="#svg-arrow-right"></use></svg></i></a></span></div>
<div class="details docutils container">
<div class="table-wrapper fields docutils container">
<table class="fields docutils align-default">
<tbody>
<tr class="row-odd"><td><strong>Key: </strong></td>
<td><code class="docutils literal notranslate"><span class="pre">volatile.uuid</span></code></td>
</tr>
<tr class="row-even"><td><strong>Type: </strong></td>
<td><span class="ignoreP"><p>string</p>
</span></td>
</tr>
<tr class="row-odd"><td><strong>Default: </strong></td>
<td><span class="ignoreP"><p>random UUID</p>
</span></td>
</tr>
<tr class="row-even"><td><strong>Scope: </strong></td>
<td><span class="ignoreP"><p>global</p>
</span></td>
</tr>
</tbody>
</table>
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<li><a class="reference internal" href="#">Dell PowerFlex - <code class="docutils literal notranslate"><span class="pre">powerflex</span></code></a><ul>
<li><a class="reference internal" href="#terminology">Terminology</a></li>
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<li><a class="reference internal" href="#configuration-options">Configuration options</a><ul>
<li><a class="reference internal" href="#storage-pool-configuration">Storage pool configuration</a></li>
<li><a class="reference internal" href="#storage-volume-configuration">Storage volume configuration</a></li>
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