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<body class="manpage">
<div id="header">
<h1>
nvme-id-ns(1) Manual Page
</h1>
<h2>NAME</h2>
<div class="sectionbody">
<p>nvme-id-ns -
   Send NVMe Identify Namespace, return result and structure
</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 id-ns</em> <device> [--vendor-specific | -v] [--raw-binary | -b]
                        [--namespace-id=<nsid> | -n <nsid>] [--force]
                        [--human-readable | -H]
                        [--output-format=<fmt> | -o <fmt>] [--verbose | -v]</pre>
<div class="attribution">
</div></div>
</div>
</div>
<div class="sect1">
<h2 id="_description">DESCRIPTION</h2>
<div class="sectionbody">
<div class="paragraph"><p>For the NVMe device given, sends an identify namespace command and
provides the result and returned structure.</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).
If the character device is given, the <code>'--namespace-id'</code> option is
mandatory, otherwise it will use the ns-id of the namespace for the block
device you opened. For block devices, the ns-id used can be overridden
with the same option.</p></div>
<div class="paragraph"><p>On success, the structure may be returned in one of several ways depending
on the option flags; the structure may be parsed by the program or the
raw buffer may be printed to stdout.</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 identify namespace structure for the given nsid. This
        is required for the character devices, or overrides the block nsid
        if given. If the controller supports namespace management capability
        and 0xFFFFFFFF is given, then the controller returns the identify
        namespace structure that specifies common capabilities across
        namespaces for the controller.
</p>
</dd>
<dt class="hdlist1">
--force
</dt>
<dd>
<p>
        Request controller return the identify namespace structure even
        if the namespace is not attached to the controller. This is valid
        only for controllers at or newer than revision 1.2. Controllers
        at revision lower than this may interpret the command incorrectly.
</p>
</dd>
<dt class="hdlist1">
-b
</dt>
<dt class="hdlist1">
--raw-binary
</dt>
<dd>
<p>
        Print the raw buffer to stdout. Structure is not parsed by
        program. This overrides the vendor specific and human readable options.
</p>
</dd>
<dt class="hdlist1">
-V
</dt>
<dt class="hdlist1">
--vendor-specific
</dt>
<dd>
<p>
        In addition to parsing known fields, this option will dump
        the vendor specific region of the structure in hex with ascii
        interpretation.
</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">
-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>
</dl></div>
</div>
</div>
<div class="sect1">
<h2 id="_examples">EXAMPLES</h2>
<div class="sectionbody">
<div class="ulist"><ul>
<li>
<p>
Has the program interpret the returned buffer and display the known
fields in a human readable format:
</p>
<div class="listingblock">
<div class="content">
<pre><code># nvme id-ns /dev/nvme0n1</code></pre>
</div></div>
</li>
<li>
<p>
If using the character device or overriding namespace id:
</p>
<div class="listingblock">
<div class="content">
<pre><code># nvme id-ns /dev/nvme0 -n 1
# nvme id-ns /dev/nvme0n1 -n 1
# nvme id-ns /dev/nvme0 --namespace-id=1</code></pre>
</div></div>
</li>
<li>
<p>
In addition to showing the known fields, have the program to display
the vendor unique field:
</p>
<div class="listingblock">
<div class="content">
<pre><code># nvme id-ns /dev/nvme0n1 --vendor-specific
# nvme id-ns /dev/nvme0n1 -V</code></pre>
</div></div>
<div class="paragraph"><p>The above will dump the 'vs' buffer in hex since it doesn’t know how to
interpret it.</p></div>
</li>
<li>
<p>
Have the program return the raw structure in binary:
</p>
<div class="listingblock">
<div class="content">
<pre><code># nvme id-ns /dev/nvme0n1 --raw-binary > id_ns.raw
# nvme id-ns /dev/nvme0n1 -b > id_ns.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>
<li>
<p>
Alternatively you may want to send the data to another program that
can parse the raw buffer.
</p>
<div class="listingblock">
<div class="content">
<pre><code># nvme id-ns /dev/nvme0n1 --raw-binary | nvme_parse_id_ns</code></pre>
</div></div>
<div class="paragraph"><p>The parse program in the above example can be a program that shows the
structure in a way you like. The following program is such an example
that will parse it and can accept the output through a pipe, <code>'|'</code>,
as shown in the above example, or you can <code>'cat'</code> a saved output buffer
to it.</p></div>
</li>
</ul></div>
<div class="listingblock">
<div class="content">
<pre><code>/* File: nvme_parse_id_ns.c */

#include <linux/nvme.h>
#include <stdio.h>
#include <unistd.h>

int main(int argc, char **argv)
{
        unsigned char buf[sizeof(struct nvme_id_ns)];
        struct nvme_id_ns *ns = (struct nvme_id_ns *)buf;

        if (read(STDIN_FILENO, buf, sizeof(buf)))
                return 1;

        printf("nsze : %#llx\n", ns->nsze);
        printf("ncap : %#llx\n", ns->ncap);
        return 0;
}</code></pre>
</div></div>
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<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>
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Last updated
 2025-02-13 00:00:00 UTC
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