static/netbsd/man4/ch.4 4.html


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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>