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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;]
                        [--block-size=&lt;size&gt; | -b &lt;size&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]
                        [--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 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">
-b &lt;size&gt;
</dt>
<dt class="hdlist1">
--block-size=&lt;size&gt;
</dt>
<dd>
<p>
        If specified, the logical block size in bytes, with metasize
        also describing the metadata size for an individual block.
        Discovered by identify namespace otherwise.
</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 transferred in bytes.
</p>
</dd>
<dt class="hdlist1">
-r &lt;reftag&gt;
</dt>
<dt class="hdlist1">
--ref-tag=&lt;reftag&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>
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<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">
-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
        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
 2025-11-19 00:00:00 UTC
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