githubmirror/nvme-cli

Documentation/nvme-read.html
1 103 строки25 KB
Daniel Wagner
doc: Regenerate all docs for v2.13
11 апр 2025, 14:26
11 апр 2025, 14:26e037a6e
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<body class="manpage">
<div id="header">
<h1>
nvme-read(1) Manual Page
</h1>
<h2>NAME</h2>
<div class="sectionbody">
<p>nvme-read -
   Send an NVMe Read command, provide 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-read</em> &lt;device&gt; [--start-block=&lt;slba&gt; | -s &lt;slba&gt;]
                        [--block-count=&lt;nlb&gt; | -c &lt;nlb&gt;]
                        [--data-size=&lt;size&gt; | -z &lt;size&gt;]
                        [--metadata-size=&lt;size&gt; | -y &lt;size&gt;]
                        [--ref-tag=&lt;reftag&gt; | -r &lt;reftag&gt;]
                        [--data=&lt;data-file&gt; | -d &lt;data-file&gt;]
                        [--metadata=&lt;metadata-file&gt; | -M &lt;metadata-file&gt;]
                        [--prinfo=&lt;prinfo&gt; | -p &lt;prinfo&gt;]
                        [--app-tag-mask=&lt;appmask&gt; | -m &lt;appmask&gt;]
                        [--app-tag=&lt;apptag&gt; | -a &lt;apptag&gt;]
                        [--limited-retry | -l] [--force-unit-access | -f]
                        [--dir-type=&lt;type&gt; | -T &lt;type&gt;]
                        [--dir-spec=&lt;spec&gt; | -S &lt;spec&gt;] [--dsm=&lt;dsm&gt; | -D &lt;dsm&gt;]
                        [--show-command | -V] [--dry-run | -w] [--latency | -t]
                        [--storage-tag&lt;storage-tag&gt; | -g &lt;storage-tag&gt;]
                        [--storage-tag-check | -C] [--force]
                        [--output-format=&lt;fmt&gt; | -o &lt;fmt&gt;] [--verbose | -v]
                        [--timeout=&lt;timeout&gt;]</pre>
<div class="attribution">
</div></div>
</div>
</div>
<div class="sect1">
<h2 id="_description">DESCRIPTION</h2>
<div class="sectionbody">
<div class="paragraph"><p>The Read command reads the logical blocks specified by the command from
the medium and copies to the data data buffer provided. Will use stdout
by default if you don&#8217;t provide a file.</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_options">OPTIONS</h2>
<div class="sectionbody">
<div class="dlist"><dl>
<dt class="hdlist1">
-s &lt;slba&gt;
</dt>
<dt class="hdlist1">
--start-block=&lt;slba&gt;
</dt>
<dd>
<p>
        Start block.
</p>
</dd>
<dt class="hdlist1">
-c
</dt>
<dt class="hdlist1">
--block-count
</dt>
<dd>
<p>
        The number of blocks to transfer. This is a zeroes based value to
        align with the kernel&#8217;s use of this field. (ie. 0 means transfer
        1 block).
</p>
</dd>
<dt class="hdlist1">
-z &lt;size&gt;
</dt>
<dt class="hdlist1">
--data-size=&lt;size&gt;
</dt>
<dd>
<p>
        Size of data, in bytes.
</p>
</dd>
<dt class="hdlist1">
-y &lt;size&gt;
</dt>
<dt class="hdlist1">
--metadata-size=&lt;size&gt;
</dt>
<dd>
<p>
        Size of metadata in bytes.
</p>
</dd>
<dt class="hdlist1">
-d &lt;data-file&gt;
</dt>
<dt class="hdlist1">
--data=&lt;data-file&gt;
</dt>
<dd>
<p>
        Data file. If none provided, contents are sent to STDOUT.
</p>
</dd>
<dt class="hdlist1">
-M &lt;metadata-file&gt;
</dt>
<dt class="hdlist1">
--metadata=&lt;metadata-file&gt;
</dt>
<dd>
<p>
        Metadata file, if necessary.
</p>
</dd>
<dt class="hdlist1">
-p &lt;prinfo&gt;
</dt>
<dt class="hdlist1">
--prinfo=&lt;prinfo&gt;
</dt>
<dd>
<p>
        Protection Information field definition.
</p>
<div class="tableblock">
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width="100%"
frame="border"
cellspacing="0" cellpadding="4">
<col width="50%" />
<col width="50%" />
<tbody>
<tr>
<td align="left" valign="top"><p class="table">Bit</p></td>
<td align="left" valign="top"><p class="table">Description</p></td>
</tr>
<tr>
<td align="left" valign="top"><p class="table">3</p></td>
<td align="left" valign="top"><p class="table">PRACT: Protection Information Action. When set to 1, PI is stripped/inserted
on read/write when the block format&#8217;s metadata size is 8. When set to 0,
metadata is passes.</p></td>
</tr>
<tr>
<td align="left" valign="top"><p class="table">2:0</p></td>
<td align="left" valign="top"><p class="table">PRCHK: Protection Information Check:</p></td>
</tr>
<tr>
<td align="left" valign="top"><p class="table">2</p></td>
<td align="left" valign="top"><p class="table">Set to 1 enables checking the guard tag</p></td>
</tr>
<tr>
<td align="left" valign="top"><p class="table">1</p></td>
<td align="left" valign="top"><p class="table">Set to 1 enables checking the application tag</p></td>
</tr>
<tr>
<td align="left" valign="top"><p class="table">0</p></td>
<td align="left" valign="top"><p class="table">Set to 1 enables checking the reference tag</p></td>
</tr>
</tbody>
</table>
</div>
</dd>
<dt class="hdlist1">
-r &lt;reftag&gt;
</dt>
<dt class="hdlist1">
--ref-tag=&lt;reftag&gt;
</dt>
<dd>
<p>
        Optional reftag when used with protection information.
</p>
</dd>
<dt class="hdlist1">
-m &lt;appmask&gt;
</dt>
<dt class="hdlist1">
--app-tag-mask=&lt;appmask&gt;
</dt>
<dd>
<p>
        Optional application tag mask when used with protection information.
</p>
</dd>
<dt class="hdlist1">
-f
</dt>
<dt class="hdlist1">
--force-unit-access
</dt>
<dd>
<p>
        Set the force-unit access flag.
</p>
</dd>
<dt class="hdlist1">
-T &lt;type&gt;
</dt>
<dt class="hdlist1">
--dir-type=&lt;type&gt;
</dt>
<dd>
<p>
        Optional directive type. The nvme-cli only enforces the value
        be in the defined range for the directive type, though the NVMe
        specification (1.3a) defines only one directive, 01h, for write
        stream identifiers.
</p>
</dd>
<dt class="hdlist1">
-S &lt;spec&gt;
</dt>
<dt class="hdlist1">
--dir-spec=&lt;spec&gt;
</dt>
<dd>
<p>
        Optional field for directive specifics. When used with
        write streams, this value is defined to be the write stream
        identifier. The nvme-cli will not validate the stream requested
        is within the controller&#8217;s capabilities.
</p>
</dd>
<dt class="hdlist1">
-D &lt;dsm&gt;
</dt>
<dt class="hdlist1">
--dsm=&lt;dsm&gt;
</dt>
<dd>
<p>
        The optional data set management attributes for this command. The argument
        for this is the least significant 8 bits of the DSM field in a write
        command; the most significant 16 bits of the field come from the directive
        specific field, if used. This may be used to set attributes for
        the LBAs being written, like access frequency, type, latency,
        among other things, as well as yet to be defined types. Please
        consult the NVMe specification for detailed breakdown of how to
        use this field.
</p>
</dd>
<dt class="hdlist1">
-V
</dt>
<dt class="hdlist1">
--show-cmd
</dt>
<dd>
<p>
        Print out the command to be sent.
</p>
</dd>
<dt class="hdlist1">
-w
</dt>
<dt class="hdlist1">
--dry-run
</dt>
<dd>
<p>
        Do not actually send the command. If want to use --dry-run option,
        --show-cmd option <em>must</em> be set. Otherwise --dry-run option will be
        <em>ignored</em>.
</p>
</dd>
<dt class="hdlist1">
-t
</dt>
<dt class="hdlist1">
--latency
</dt>
<dd>
<p>
        Print out the latency the IOCTL took (in us).
</p>
</dd>
<dt class="hdlist1">
-g &lt;storage-tag&gt;
</dt>
<dt class="hdlist1">
--storage-tag=&lt;storage-tag&gt;
</dt>
<dd>
<p>
        Variable Sized Expected Logical Block Storage Tag(ELBST).
</p>
</dd>
<dt class="hdlist1">
-C
</dt>
<dt class="hdlist1">
--storage-tag-check
</dt>
<dd>
<p>
        This flag enables Storage Tag field checking as part of end-to-end
        data protection processing.
</p>
</dd>
<dt class="hdlist1">
--force
</dt>
<dd>
<p>
        Ignore namespace is currently busy and performed the operation
        even though.
</p>
</dd>
<dt class="hdlist1">
-o &lt;fmt&gt;
</dt>
<dt class="hdlist1">
--output-format=&lt;fmt&gt;
</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">
--timeout=&lt;timeout&gt;
</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="paragraph"><p>No examples yet.</p></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
 2025-04-11 13:25:46 CEST
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