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View File Name : nvme-get-feature.html

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<body class="manpage">
<div id="header">
<h1>
nvme-get-feature(1) Manual Page
</h1>
<h2>NAME</h2>
<div class="sectionbody">
<p>nvme-get-feature -
   Gets an NVMe feature, returns applicable results
</p>
</div>
</div>
<div id="content">
<div class="sect1">
<h2 id="_synopsis">SYNOPSIS</h2>
<div class="sectionbody">
<div class="verseblock">
<pre class="content"><em>nvme get-feature</em> <device> [--namespace-id=<nsid> | -n <nsid>]
                        [--feature-id=<fid> | -f <fid>]
                        [--uuid-index=<uuid-index> | -U <uuid_index>]
                        [--data-len=<data-len> | -l <data-len>]
                        [--sel=<select> | -s <select>]
                        [--raw-binary | -b] [--cdw11=<cdw11> | -c <cdw11>]
                        [--human-readable | -H] [--changed | -C]
                        [--output-format=<fmt> | -o <fmt>] [--verbose | -v]
                        [--timeout=<timeout> | -t <timeout>]</pre>
<div class="attribution">
</div></div>
</div>
</div>
<div class="sect1">
<h2 id="_description">DESCRIPTION</h2>
<div class="sectionbody">
<div class="paragraph"><p>Submits an NVMe Get Feature admin command and returns the applicable
results. This may be the feature’s value, or may also include a feature
structure if the feature requires it (ex: LBA Range Type).</p></div>
<div class="paragraph"><p>The <device> parameter is mandatory and may be either the NVMe character
device (ex: /dev/nvme0), or a namespace block device (ex: /dev/nvme0n1).</p></div>
<div class="paragraph"><p>On success, the returned feature’s structure (if applicable) may be
returned in one of several ways depending on the option flags; the
structure may parsed by the program and printed in a readable format
if it is a known structure, displayed in hex, or the raw buffer may be
printed to stdout for another program to parse.</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_options">OPTIONS</h2>
<div class="sectionbody">
<div class="dlist"><dl>
<dt class="hdlist1">
-n <nsid>
</dt>
<dt class="hdlist1">
--namespace-id=<nsid>
</dt>
<dd>
<p>
        Retrieve the feature for the given nsid. This is optional and
        most features do not use this value.
</p>
</dd>
<dt class="hdlist1">
-f <fid>
</dt>
<dt class="hdlist1">
--feature-id=<fid>
</dt>
<dd>
<p>
        The feature id to send with the command. Value provided should
        be in hex.
</p>
</dd>
<dt class="hdlist1">
-s <select>
</dt>
<dt class="hdlist1">
--sel=<select>
</dt>
<dd>
<p>
        Select (SEL): This field specifies which value of the attributes
        to return in the provided data:
</p>
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<table rules="all"
width="100%"
frame="border"
cellspacing="0" cellpadding="4">
<col width="50%" />
<col width="50%" />
<tbody>
<tr>
<td align="left" valign="top"><p class="table">Select</p></td>
<td align="left" valign="top"><p class="table">Description</p></td>
</tr>
<tr>
<td align="left" valign="top"><p class="table">0</p></td>
<td align="left" valign="top"><p class="table">Current</p></td>
</tr>
<tr>
<td align="left" valign="top"><p class="table">1</p></td>
<td align="left" valign="top"><p class="table">Default</p></td>
</tr>
<tr>
<td align="left" valign="top"><p class="table">2</p></td>
<td align="left" valign="top"><p class="table">Saved</p></td>
</tr>
<tr>
<td align="left" valign="top"><p class="table">3</p></td>
<td align="left" valign="top"><p class="table">Supported capabilities</p></td>
</tr>
<tr>
<td align="left" valign="top"><p class="table">4-7</p></td>
<td align="left" valign="top"><p class="table">Reserved</p></td>
</tr>
</tbody>
</table>
</div>
</dd>
<dt class="hdlist1">
-U <uuid-index>
</dt>
<dt class="hdlist1">
--uuid-index=<uuid-index>
</dt>
<dd>
<p>
        UUID Index of the feature
</p>
</dd>
<dt class="hdlist1">
-l <data-len>
</dt>
<dt class="hdlist1">
--data-len=<data-len>
</dt>
<dd>
<p>
        The data length for the buffer returned for this feature. Most
        known features do not use this value. The exception is LBA
        Range Type
</p>
</dd>
<dt class="hdlist1">
-c <cdw11>
</dt>
<dt class="hdlist1">
--cdw11=<cdw11>
</dt>
<dd>
<p>
        The value for command dword 11, if applicable.
</p>
</dd>
<dt class="hdlist1">
-b
</dt>
<dt class="hdlist1">
--raw-binary
</dt>
<dd>
<p>
        Print the raw feature buffer to stdout if the feature returns
        a structure.
</p>
</dd>
<dt class="hdlist1">
-H
</dt>
<dt class="hdlist1">
--human-readable
</dt>
<dd>
<p>
        This option will parse and format many of the bit fields
        into human-readable formats.
</p>
</dd>
<dt class="hdlist1">
-C
</dt>
<dt class="hdlist1">
--changed
</dt>
<dd>
<p>
        This option will show feature changed.
</p>
</dd>
<dt class="hdlist1">
-o <fmt>
</dt>
<dt class="hdlist1">
--output-format=<fmt>
</dt>
<dd>
<p>
        Set the reporting format to <em>normal</em>, <em>json</em> or <em>binary</em>. Only one
        output format can be used at a time.
</p>
</dd>
<dt class="hdlist1">
-v
</dt>
<dt class="hdlist1">
--verbose
</dt>
<dd>
<p>
        Increase the information detail in the output.
</p>
</dd>
<dt class="hdlist1">
-t <timeout>
</dt>
<dt class="hdlist1">
--timeout=<timeout>
</dt>
<dd>
<p>
        Override default timeout value. In milliseconds.
</p>
</dd>
</dl></div>
</div>
</div>
<div class="sect1">
<h2 id="_examples">EXAMPLES</h2>
<div class="sectionbody">
<div class="ulist"><ul>
<li>
<p>
Retrieves the feature for Number of Queues, or feature id 7:
</p>
<div class="listingblock">
<div class="content">
<pre><code># nvme get-feature /dev/nvme0 -f 7</code></pre>
</div></div>
</li>
<li>
<p>
The following retrieves the feature for the LBA Range Type, which
implicitly requires a buffer and will be printed to the screen in human
readable format:
</p>
<div class="listingblock">
<div class="content">
<pre><code># nvme get-feature /dev/nvme0 -f 3</code></pre>
</div></div>
</li>
<li>
<p>
Retrieves the feature for the some vendor specific feature and
specifically requesting a buffer be allocate for this feature, which
will be displayed to the user in as a hex dump:
</p>
<div class="listingblock">
<div class="content">
<pre><code># nvme get-feature /dev/nvme0 -f 0xc0 -l 512</code></pre>
</div></div>
<div class="paragraph"><p>Get feature with UUID index</p></div>
</li>
</ul></div>
<div class="listingblock">
<div class="content">
<pre><code># nvme get-feature /dev/nvme0 -f 0xc0 -l 512 -U 0x1</code></pre>
</div></div>
<div class="ulist"><ul>
<li>
<p>
The following retrieves the feature for the LBA Range Type, which
implicitly requires a buffer and will be saved to a file in its raw
format:
</p>
<div class="listingblock">
<div class="content">
<pre><code># nvme get-feature /dev/nvme0 -f 3 --raw-binary > lba_range.raw</code></pre>
</div></div>
<div class="paragraph"><p>It is probably a bad idea to not redirect stdout when using this mode.</p></div>
</li>
</ul></div>
</div>
</div>
<div class="sect1">
<h2 id="_nvme">NVME</h2>
<div class="sectionbody">
<div class="paragraph"><p>Part of the nvme-user suite</p></div>
</div>
</div>
</div>
<div id="footnotes"><hr /></div>
<div id="footer">
<div id="footer-text">
Last updated
 2025-02-13 00:00:00 UTC
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