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+<body class="manpage">
+<div id="header">
+<h1>
+nvme-compare(1) Manual Page
+</h1>
+<h2>NAME</h2>
+<div class="sectionbody">
+<p>nvme-compare -
+ Send an NVMe Compare 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-compare</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;metasize&gt; | -y &lt;metasize&gt;]
+ [--ref-tag=&lt;reftag&gt; | -r &lt;reftag&gt;]
+ [--data=&lt;data-file&gt; | -d &lt;data-file&gt;]
+ [--metadata=&lt;meta&gt; | -M &lt;meta&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]</pre>
+<div class="attribution">
+</div></div>
+</div>
+</div>
+<div class="sect1">
+<h2 id="_description">DESCRIPTION</h2>
+<div class="sectionbody">
+<div class="paragraph"><p>The Compare command reads the logical blocks specified by the command
+from the medium and compares the data read to a comparison data buffer
+transferred as part of the command. If the data read from the controller
+and the comparison data buffer are equivalent with no miscompares,
+then the command completes successfully. If there is any miscompare,
+the command completes with an error of Compare Failure. If metadata is
+provided, then a comparison is also performed for the metadata.</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>
+ 64-bit address of the first block to access.
+</p>
+</dd>
+<dt class="hdlist1">
+-c &lt;nlb&gt;
+</dt>
+<dt class="hdlist1">
+--block-count=&lt;nlb&gt;
+</dt>
+<dd>
+<p>
+ Number of blocks to be accessed (zero-based).
+</p>
+</dd>
+<dt class="hdlist1">
+-z &lt;size&gt;
+</dt>
+<dt class="hdlist1">
+--data-size=&lt;size&gt;
+</dt>
+<dd>
+<p>
+ Size of data to be compared in bytes.
+</p>
+</dd>
+<dt class="hdlist1">
+-y &lt;metasize&gt;
+</dt>
+<dt class="hdlist1">
+--metadata-size=&lt;metasize&gt;
+</dt>
+<dd>
+<p>
+ Size of metadata to be trasnferred in bytes.
+</p>
+</dd>
+<dt class="hdlist1">
+-r &lt;reftag&gt;
+</dt>
+<dt class="hdlist1">
+--ref-tag=&lt;regtag&gt;
+</dt>
+<dd>
+<p>
+ Reference Tag for Protection Information
+</p>
+</dd>
+<dt class="hdlist1">
+-d &lt;data-file&gt;
+</dt>
+<dt class="hdlist1">
+--data=&lt;data-file&gt;
+</dt>
+<dd>
+<p>
+ Data file.
+</p>
+</dd>
+<dt class="hdlist1">
+-M &lt;meta&gt;
+</dt>
+<dt class="hdlist1">
+--metadata=&lt;meta&gt;
+</dt>
+<dd>
+<p>
+ Metadata file.
+</p>
+</dd>
+<dt class="hdlist1">
+-p &lt;prinfo&gt;
+</dt>
+<dt class="hdlist1">
+--prinfo=&lt;prinfo&gt;
+</dt>
+<dd>
+<p>
+ Protection Information and check field.
+</p>
+</dd>
+</dl></div>
+<div class="paragraph"><p>+</p></div>
+<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&#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>
+<div class="dlist"><dl>
+<dt class="hdlist1">
+-m &lt;appmask&gt;
+</dt>
+<dt class="hdlist1">
+--app-tag-mask=&lt;appmask&gt;
+</dt>
+<dd>
+<p>
+ App Tag Mask for Protection Information
+</p>
+</dd>
+<dt class="hdlist1">
+-a &lt;apptag&gt;
+</dt>
+<dt class="hdlist1">
+--app-tag=&lt;apptag&gt;
+</dt>
+<dd>
+<p>
+ App Tag for Protection Information
+</p>
+</dd>
+<dt class="hdlist1">
+-l
+</dt>
+<dt class="hdlist1">
+--limited-retry
+</dt>
+<dd>
+<p>
+ Number of limited attempts to media.
+</p>
+</dd>
+<dt class="hdlist1">
+-f
+</dt>
+<dt class="hdlist1">
+--force-unit-access
+</dt>
+<dd>
+<p>
+ FUA option to guarantee that data is stored to media.
+</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
+ specifcation (1.3a) defines only one directive, 01h, for write
+ stream idenfiers.
+</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 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 2018-12-17 13:07:47 MST
+</div>
+</div>
+</body>
+</html>