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-<table class="head">
- <tr>
- <td class="head-ltitle">XBD(4)</td>
- <td class="head-vol">Device Drivers Manual (xen)</td>
- <td class="head-rtitle">XBD(4)</td>
- </tr>
-</table>
-<div class="manual-text">
-<section class="Sh">
-<h1 class="Sh" id="NAME"><a class="permalink" href="#NAME">NAME</a></h1>
-<p class="Pp"><code class="Nm">xbd</code> &#x2014; <span class="Nd">Xen frontend
- paravirtualized block device interface</span></p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="SYNOPSIS"><a class="permalink" href="#SYNOPSIS">SYNOPSIS</a></h1>
-<p class="Pp"><code class="Cd">xbd* at xenbus?</code></p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="DESCRIPTION"><a class="permalink" href="#DESCRIPTION">DESCRIPTION</a></h1>
-<p class="Pp">The <code class="Nm">xbd</code> interface forms the frontend part
- of the paravirtualized drivers used by Xen guest domains to have a block
- device interface.</p>
-<p class="Pp">From a guest point of view, <code class="Nm">xbd</code> is similar
- to a hard disk, and can be treated in the very same way regarding
- partitioning, file systems creation and usage, and mounting. By default, a
- <span class="Ux">NetBSD</span> guest domain will assume that
- &#x201C;xbd0a&#x201D; serves as the root file system.</p>
-<p class="Pp">When the host is <span class="Ux">NetBSD</span>, the
- <code class="Nm">xbd</code> interface is backed by a
- <a class="Xr">xbdback(4)</a> interface. In the XenStore,
- <code class="Nm">xbd</code> and <code class="Nm">xbdback</code> are
- identified by &#x201C;vbd&#x201D; (virtual block device) entries.</p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="DIAGNOSTICS"><a class="permalink" href="#DIAGNOSTICS">DIAGNOSTICS</a></h1>
-<dl class="Bl-diag">
- <dt>xbd%d: using event channel %d</dt>
- <dd>Specifies the event channel used by this <code class="Nm">xbd</code>
- interface.</dd>
- <dt>xbd%d: %s MB, %d bytes/sect x %u sectors</dt>
- <dd>Gives the total size of the <code class="Nm">xbd</code> block device, its
- sector size and total number of sectors.</dd>
- <dt>xbd%d: WARNING: cache flush not supported by backend</dt>
- <dd>The backend driver associated with this <code class="Nm">xbd</code> device
- does not support cache flushing operation. This can be problematic for
- file system operations that require cache sync to avoid data loss or
- corruption.</dd>
-</dl>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="SEE_ALSO"><a class="permalink" href="#SEE_ALSO">SEE
- ALSO</a></h1>
-<p class="Pp"><a class="Xr">xbdback(4)</a>, <a class="Xr">xenbus(4)</a>,
- <a class="Xr">dkctl(8)</a></p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="HISTORY"><a class="permalink" href="#HISTORY">HISTORY</a></h1>
-<p class="Pp">The <code class="Nm">xbd</code> driver first appeared in
- <span class="Ux">NetBSD 3.0</span>.</p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="AUTHORS"><a class="permalink" href="#AUTHORS">AUTHORS</a></h1>
-<p class="Pp">The <code class="Nm">xbd</code> driver was written by
- <span class="An">Manuel Bouyer</span>
- &lt;<a class="Mt" href="mailto:bouyer@NetBSD.org">bouyer@NetBSD.org</a>&gt;.</p>
-</section>
-</div>
-<table class="foot">
- <tr>
- <td class="foot-date">January 8, 2011</td>
- <td class="foot-os">NetBSD 10.1</td>
- </tr>
-</table>