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authorJacob McDonnell <jacob@jacobmcdonnell.com>2026-04-25 19:55:15 -0400
committerJacob McDonnell <jacob@jacobmcdonnell.com>2026-04-25 19:55:15 -0400
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+<table class="head">
+ <tr>
+ <td class="head-ltitle">CH(4)</td>
+ <td class="head-vol">Device Drivers Manual</td>
+ <td class="head-rtitle">CH(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">ch</code> &#x2014; <span class="Nd">SCSI media
+ changer driver</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">ch* at scsibus? target ? lun ?</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">ch</code> driver is essentially an
+ <a class="Xr">ioctl(2)</a> interface to a robot on a SCSI bus - a device
+ that will change media (e.g. tapes, CD-ROMs, etc) in and out of drives for
+ that media. The <a class="Xr">chio(1)</a> utility program uses this
+ interface to manipulate such robots.</p>
+</section>
+<section class="Sh">
+<h1 class="Sh" id="FILES"><a class="permalink" href="#FILES">FILES</a></h1>
+<dl class="Bl-tag Bl-compact">
+ <dt><span class="Pa">/dev/ch</span><var class="Ar">u</var></dt>
+ <dd>SCSI bus media changer unit <var class="Ar">u</var></dd>
+</dl>
+<p class="Pp"><span class="Pa">/usr/include/sys/chio.h</span></p>
+</section>
+<section class="Sh">
+<h1 class="Sh" id="DIAGNOSTICS"><a class="permalink" href="#DIAGNOSTICS">DIAGNOSTICS</a></h1>
+<dl class="Bl-diag">
+ <dt>ch%d: waiting %d seconds for changer to settle...</dt>
+ <dd>Some changers require a long time to settle out, to do tape inventory, for
+ instance.</dd>
+ <dt>ch%d: offline</dt>
+ <dd>The changer is not responding.</dd>
+ <dt>ch%d: warning, READ ELEMENT STATUS avail != count</dt>
+ <dd></dd>
+ <dt>ch%d: could not sense element address page</dt>
+ <dd></dd>
+ <dt>ch%d: could not sense capabilities page</dt>
+ <dd></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">chio(1)</a>, <a class="Xr">ioctl(2)</a>,
+ <a class="Xr">cd(4)</a>, <a class="Xr">intro(4)</a>,
+ <a class="Xr">scsi(4)</a>, <a class="Xr">st(4)</a></p>
+</section>
+<section class="Sh">
+<h1 class="Sh" id="AUTHORS"><a class="permalink" href="#AUTHORS">AUTHORS</a></h1>
+<p class="Pp"><span class="An">Jason R. Thorpe</span></p>
+</section>
+</div>
+<table class="foot">
+ <tr>
+ <td class="foot-date">June 10, 1998</td>
+ <td class="foot-os">NetBSD 10.1</td>
+ </tr>
+</table>