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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> <device> [--start-block=<slba> | -s <slba>]
[--block-count=<nlb> | -c <nlb>]
[--data-size=<size> | -z <size>]
[--metadata-size=<size> | -y <size>]
[--ref-tag=<reftag> | -r <reftag>]
[--data=<data-file> | -d <data-file>]
[--metadata=<metadata-file> | -M <metadata-file>]
[--prinfo=<prinfo> | -p <prinfo>]
[--app-tag-mask=<appmask> | -m <appmask>]
[--app-tag=<apptag> | -a <apptag>]
[--limited-retry | -l]
[--force-unit-access | -f]
[--dir-type=<type> | -T <type>]
[--dir-spec=<spec> | -S <spec>]
[--dsm=<dsm> | -D <dsm>]
[--show-command | -v]
[--dry-run | -w]
[--latency | -t]</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’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">
--start-block=<slba>
</dt>
<dt class="hdlist1">
-s <slba>
</dt>
<dd>
<p>
Start block.
</p>
</dd>
<dt class="hdlist1">
--block-count
</dt>
<dt class="hdlist1">
-c
</dt>
<dd>
<p>
The number of blocks to transfer. This is a zeroes based value to
align with the kernel’s use of this field. (ie. 0 means transfer
1 block).
</p>
</dd>
<dt class="hdlist1">
--data-size=<size>
</dt>
<dt class="hdlist1">
-z <size>
</dt>
<dd>
<p>
Size of data, in bytes.
</p>
</dd>
<dt class="hdlist1">
--metadata-size=<size>
</dt>
<dt class="hdlist1">
-y <size>
</dt>
<dd>
<p>
Size of metadata in bytes.
</p>
</dd>
<dt class="hdlist1">
--data=<data-file>
</dt>
<dt class="hdlist1">
-d <data-file>
</dt>
<dd>
<p>
Data file. If none provided, contents are sent to STDOUT.
</p>
</dd>
<dt class="hdlist1">
--metadata=<metadata-file>
</dt>
<dt class="hdlist1">
-M <metadata-file>
</dt>
<dd>
<p>
Metadata file, if necessary.
</p>
</dd>
<dt class="hdlist1">
--prinfo=<prinfo>
</dt>
<dt class="hdlist1">
-p <prinfo>
</dt>
<dd>
<p>
Protection Information field definition.
</p>
<div class="tableblock">
<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">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’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">
--ref-tag=<reftag>
</dt>
<dt class="hdlist1">
-r <reftag>
</dt>
<dd>
<p>
Optional reftag when used with protection information.
</p>
</dd>
<dt class="hdlist1">
--app-tag-mask=<appmask>
</dt>
<dt class="hdlist1">
-m <appmask>
</dt>
<dd>
<p>
Optional application tag mask when used with protection information.
</p>
</dd>
<dt class="hdlist1">
--force-unit-access
</dt>
<dt class="hdlist1">
-f
</dt>
<dd>
<p>
Set the force-unit access flag.
</p>
</dd>
<dt class="hdlist1">
-T <type>
</dt>
<dt class="hdlist1">
--dir-type=<type>
</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
specifcation (1.3a) defines only one directive, 01h, for write
stream idenfiers.
</p>
</dd>
<dt class="hdlist1">
-S <spec>
</dt>
<dt class="hdlist1">
--dir-spec=<spec>
</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’s capabilities.
</p>
</dd>
<dt class="hdlist1">
-D <dsm>
</dt>
<dt class="hdlist1">
--dsm=<dsm>
</dt>
<dd>
<p>
The optional data set management attributes for this command. The
argument for this is the lower 16 bits of the DSM field in a write
command; the upper 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>
</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
2019-10-12 00:12:24 JST
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