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          <section id="hpe-alletra-alletra">
<span id="storage-alletra"></span><h1>HPE Alletra - <code class="docutils literal notranslate"><span class="pre">alletra</span></code><a class="headerlink" href="#hpe-alletra-alletra" title="Link to this heading">¶</a></h1>
<p><a class="reference external" href="https://www.hpe.com/emea_europe/en/hpe-alletra.html">HPE Alletra</a> is a storage solution. It offers the consumption of redundant block storage across the network.</p>
<p>LXD supports connecting to HPE Alletra storage through <abbr title="Non-Volatile Memory Express over Transmission Control Protocol">NVMe/TCP</abbr>.
In addition, HPE Alletra offers copy-on-write snapshots, thin provisioning, and other features.</p>
<p>Using HPE Alletra with LXD requires a HPE Alletra WSAPI version <code class="docutils literal notranslate"><span class="pre">1</span></code>. Additionally, ensure that the required kernel modules for the selected protocol are installed on your host system.</p>
<section id="terminology">
<span id="storage-alletra-terminology"></span><h2>Terminology<a class="headerlink" href="#terminology" title="Link to this heading">¶</a></h2>
<p>Each storage pool created in LXD using an HPE Alletra driver represents an HPE Alletra <em>volume set</em>, which is an abstraction that groups multiple volumes under a specific name.</p>
<p>LXD creates volumes within a volume set that is identified by the storage pool name.
When the first volume needs to be mapped to a specific LXD host, a corresponding HPE Alletra host entity is created with the name of the LXD host and a suffix of the used protocol.
For example, if the LXD host is <code class="docutils literal notranslate"><span class="pre">host01</span></code> and the mode is <code class="docutils literal notranslate"><span class="pre">nvme</span></code>, the resulting HPE Alletra host entity would be <code class="docutils literal notranslate"><span class="pre">host01-nvme</span></code>.</p>
<p>The HPE Alletra host is then connected with the required volumes to allow attaching and accessing volumes from the LXD host.
The HPE Alletra host is automatically removed once there are no volumes connected to it.</p>
</section>
<section id="the-alletra-driver-in-lxd">
<span id="storage-alletra-driver"></span><h2>The <code class="docutils literal notranslate"><span class="pre">alletra</span></code> driver in LXD<a class="headerlink" href="#the-alletra-driver-in-lxd" title="Link to this heading">¶</a></h2>
<p>The <code class="docutils literal notranslate"><span class="pre">alletra</span></code> driver in LXD uses HPE Alletra volumes for custom storage volumes, instances, and snapshots.
All created volumes are thin-provisioned block volumes. If required (for example, for containers and custom file system volumes), LXD formats the volume with a desired file system.</p>
<p>LXD expects HPE Alletra to be pre-configured with a specific service (such as iSCSI) on the network interfaces whose addresses you provide during storage pool configuration.
Furthermore, LXD assumes that it has full control over the HPE Alletra volume sets it manages.
Therefore, do not keep any volumes in HPE Alletra volume sets unless they are owned by LXD, because LXD might disconnect or even delete them.</p>
<p>This driver provides remote storage.
As a result, and depending on the internal network, storage access might be a bit slower compared to local storage.
On the other hand, using remote storage has significant advantages in a cluster setup: all cluster members have access to the same storage pools with the exact same contents, without the need to synchronize them.</p>
<p>When creating a new storage pool using the <code class="docutils literal notranslate"><span class="pre">alletra</span></code> driver, LXD automatically discovers the array’s qualified name and target address.
Upon successful discovery, LXD attaches all volumes that are connected to the HPE Alletra host that is associated with a specific LXD server.
HPE Alletra hosts and volume connections (<abbr title="virtual Logical Unit Numbers">vLUNs</abbr>) are fully managed by LXD.</p>
<p>Volume snapshots are also supported by HPE Alletra. When a volume with at least one snapshot is copied, LXD sequentially copies snapshots into the destination volume, from which a new snapshot is created. Finally, once all snapshots are copied, the source volume is copied into the destination volume.</p>
<section id="volume-names">
<span id="storage-alletra-volume-names"></span><h3>Volume names<a class="headerlink" href="#volume-names" title="Link to this heading">¶</a></h3>
<p>As a Pure storage driver, the <code class="docutils literal notranslate"><span class="pre">alletra</span></code> driver uses the volume’s <a class="configref reference internal" href="#storage-alletra-volume-conf:volatile.uuid"><code class="docutils literal notranslate"><span class="pre">volatile.uuid</span></code></a> to generate a volume name.</p>
<p>For example, a UUID <code class="docutils literal notranslate"><span class="pre">5a2504b0-6a6c-4849-8ee7-ddb0b674fd14</span></code> is first trimmed of any hyphens (<code class="docutils literal notranslate"><span class="pre">-</span></code>), resulting in the string <code class="docutils literal notranslate"><span class="pre">5a2504b06a6c48498ee7ddb0b674fd14</span></code>.
To distinguish volume types and snapshots, special identifiers are prepended and appended to the volume names, as depicted in the table below:</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-5a2504b06a6c48498ee7ddb0b674fd14</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-5a2504b06a6c48498ee7ddb0b674fd14-b</span></code> (block volume) and <code class="docutils literal notranslate"><span class="pre">v-5a2504b06a6c48498ee7ddb0b674fd14</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-5a2504b06a6c48498ee7ddb0b674fd14-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-5a2504b06a6c48498ee7ddb0b674fd14</span></code> (file system volume) and <code class="docutils literal notranslate"><span class="pre">u-5a2504b06a6c48498ee7ddb0b674fd14-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-5a2504b06a6c48498ee7ddb0b674fd14</span></code> (container snapshot), <code class="docutils literal notranslate"><span class="pre">sv-5a2504b06a6c48498ee7ddb0b674fd14-b</span></code> (VM snapshot) and <code class="docutils literal notranslate"><span class="pre">su-5a2504b06a6c48498ee7ddb0b674fd14</span></code> (custom volume snapshot)</p></td>
</tr>
</tbody>
</table>
</div>
</section>
<section id="limitations">
<span id="storage-alletra-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">alletra</span></code> driver has the following limitations:</p>
<dl class="simple myst">
<dt>Volume size constraints</dt><dd><p>The minimum volume size (quota) is <code class="docutils literal notranslate"><span class="pre">256MiB</span></code> and must be a multiple of <code class="docutils literal notranslate"><span class="pre">256MiB</span></code>. If the requested size does not meet these conditions, LXD automatically rounds it up to the nearest valid value.</p>
</dd>
<dt>Sharing an HPE Alletra storage pool between multiple LXD installations</dt><dd><p>Sharing an HPE Alletra array among multiple LXD installations is possible, provided that the installations use distinct storage pool names. Storage pools are implemented as volume sets on the array, and volume set names must be unique.</p>
</dd>
<dt>Recovering HPE Alletra storage pools</dt><dd><p>Recovery of HPE Alletra storage pools using <code class="docutils literal notranslate"><span class="pre">lxd</span> <span class="pre">recover</span></code> is currently not supported.</p>
</dd>
</dl>
</section>
</section>
<section id="configuration-options">
<span id="storage-alletra-options"></span><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">alletra</span></code> driver, as well as storage volumes in these pools.</p>
<section id="storage-pool-configuration">
<span id="storage-alletra-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-alletra-pool-conf:alletra.cpg">
<div class="basicinfo docutils container">
<span class="key"><code class="docutils literal notranslate"><span class="pre">alletra.cpg</span></code></span><span class="shortdesc"><p>HPE Alletra Common Provisioning Group (CPG) name</p>
</span><span class="anchor"><a class="reference external" href="#storage-alletra-pool-conf:alletra.cpg"><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">alletra.cpg</span></code></td>
</tr>
<tr class="row-even"><td><strong>Type: </strong></td>
<td><span class="ignoreP"><p>string</p>
</span></td>
</tr>
</tbody>
</table>
</div>
</div>
</div>
<div class="configoption docutils container" id="storage-alletra-pool-conf:alletra.mode">
<div class="basicinfo docutils container">
<span class="key"><code class="docutils literal notranslate"><span class="pre">alletra.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-alletra-pool-conf:alletra.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">alletra.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>
</tbody>
</table>
</div>
<p>The mode to use to map storage volumes to the local server.
Supported values are <code class="docutils literal notranslate"><span class="pre">iscsi</span></code> and <code class="docutils literal notranslate"><span class="pre">nvme</span></code>.</p>
</div>
</div>
<div class="configoption docutils container" id="storage-alletra-pool-conf:alletra.target">
<div class="basicinfo docutils container">
<span class="key"><code class="docutils literal notranslate"><span class="pre">alletra.target</span></code></span><span class="shortdesc"><p>List of target addresses.</p>
</span><span class="anchor"><a class="reference external" href="#storage-alletra-pool-conf:alletra.target"><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">alletra.target</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>
</tbody>
</table>
</div>
<p>A comma-separated list of target addresses. If empty, LXD discovers and connects to all available targets. Otherwise, it only connects to the specified addresses.</p>
</div>
</div>
<div class="configoption docutils container" id="storage-alletra-pool-conf:alletra.user.name">
<div class="basicinfo docutils container">
<span class="key"><code class="docutils literal notranslate"><span class="pre">alletra.user.name</span></code></span><span class="shortdesc"><p>HPE Alletra storage admin username</p>
</span><span class="anchor"><a class="reference external" href="#storage-alletra-pool-conf:alletra.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">alletra.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>
</tbody>
</table>
</div>
</div>
</div>
<div class="configoption docutils container" id="storage-alletra-pool-conf:alletra.user.password">
<div class="basicinfo docutils container">
<span class="key"><code class="docutils literal notranslate"><span class="pre">alletra.user.password</span></code></span><span class="shortdesc"><p>HPE Alletra storage admin password</p>
</span><span class="anchor"><a class="reference external" href="#storage-alletra-pool-conf:alletra.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">alletra.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>
</tbody>
</table>
</div>
</div>
</div>
<div class="configoption docutils container" id="storage-alletra-pool-conf:alletra.wsapi">
<div class="basicinfo docutils container">
<span class="key"><code class="docutils literal notranslate"><span class="pre">alletra.wsapi</span></code></span><span class="shortdesc"><p>Address of the HPE Alletra Storage UI/WSAPI</p>
</span><span class="anchor"><a class="reference external" href="#storage-alletra-pool-conf:alletra.wsapi"><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">alletra.wsapi</span></code></td>
</tr>
<tr class="row-even"><td><strong>Type: </strong></td>
<td><span class="ignoreP"><p>string</p>
</span></td>
</tr>
</tbody>
</table>
</div>
</div>
</div>
<div class="configoption docutils container" id="storage-alletra-pool-conf:alletra.wsapi.verify">
<div class="basicinfo docutils container">
<span class="key"><code class="docutils literal notranslate"><span class="pre">alletra.wsapi.verify</span></code></span><span class="shortdesc"><p>Whether to verify the HPE Alletra Storage UI/WSAPI certificate</p>
</span><span class="anchor"><a class="reference external" href="#storage-alletra-pool-conf:alletra.wsapi.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">alletra.wsapi.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>
</tbody>
</table>
</div>
</div>
</div>
<div class="configoption docutils container" id="storage-alletra-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-alletra-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-alletra-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-alletra-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-alletra-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-alletra-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">10GiB</span></code></p>
</span></td>
</tr>
</tbody>
</table>
</div>
<p>Default storage volume size rounded to 256MiB. The minimum size is 256MiB.</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-alletra-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-alletra-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-alletra-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>
</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-alletra-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-alletra-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>
</tbody>
</table>
</div>
</div>
</div>
<div class="configoption docutils container" id="storage-alletra-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-alletra-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-alletra-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-alletra-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-alletra-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-alletra-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-alletra-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-alletra-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><code class="docutils literal notranslate"><span class="pre">10GiB</span></code></p>
</span></td>
</tr>
</tbody>
</table>
</div>
<p>Default storage volume size rounded to 256MiB. The minimum size is 256MiB.</p>
</div>
</div>
<div class="configoption docutils container" id="storage-alletra-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-alletra-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-alletra-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-alletra-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-alletra-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-alletra-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-alletra-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-alletra-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-alletra-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-alletra-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-alletra-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-alletra-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-alletra-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-alletra-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>
</div>
</div>
</div>
</section>
</section>
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        <ul>
<li><a class="reference internal" href="#">HPE Alletra - <code class="docutils literal notranslate"><span class="pre">alletra</span></code></a><ul>
<li><a class="reference internal" href="#terminology">Terminology</a></li>
<li><a class="reference internal" href="#the-alletra-driver-in-lxd">The <code class="docutils literal notranslate"><span class="pre">alletra</span></code> driver in LXD</a><ul>
<li><a class="reference internal" href="#volume-names">Volume names</a></li>
<li><a class="reference internal" href="#limitations">Limitations</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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