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+<table class="head">
+ <tr>
+ <td class="head-ltitle">TWS(4)</td>
+ <td class="head-vol">Device Drivers Manual</td>
+ <td class="head-rtitle">TWS(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">tws</code> &#x2014; <span class="Nd">3ware 9750
+ SATA+SAS 6Gb/s RAID controller card driver</span></p>
+</section>
+<section class="Sh">
+<h1 class="Sh" id="SYNOPSIS"><a class="permalink" href="#SYNOPSIS">SYNOPSIS</a></h1>
+<p class="Pp">To compile this driver into the kernel, place the following lines
+ in your kernel configuration file:</p>
+<div class="Bd Pp Bd-indent"><code class="Cd">device scbus</code>
+<br/>
+<code class="Cd">device tws</code></div>
+<p class="Pp">Alternatively, to load the driver as a module at boot time, place
+ the following line in <a class="Xr">loader.conf(5)</a>:</p>
+<div class="Bd Pp Bd-indent Li">
+<pre>tws_load=&quot;YES&quot;</pre>
+</div>
+</section>
+<section class="Sh">
+<h1 class="Sh" id="DESCRIPTION"><a class="permalink" href="#DESCRIPTION">DESCRIPTION</a></h1>
+<p class="Pp">The <code class="Nm">tws</code> driver provides support for LSI's
+ 3ware 9750 SATA+SAS 6Gb/s RAID controller cards.</p>
+<p class="Pp">These controllers feature the LSISAS2108 6Gb/s SAS RAID-on-Chip
+ (ROC) and are available in 4- and 8-port configurations, supports RAID
+ levels 0, 1, 5, 6, 10, 50 and single disk, with 96 SATA and/or SAS hard
+ drives and SSDs.</p>
+<p class="Pp">For further hardware information, see
+ <span class="Pa">http://www.lsi.com/.</span></p>
+</section>
+<section class="Sh">
+<h1 class="Sh" id="HARDWARE"><a class="permalink" href="#HARDWARE">HARDWARE</a></h1>
+<p class="Pp">The <code class="Nm">tws</code> driver supports the following
+ SATA/SAS RAID controller:</p>
+<p class="Pp"></p>
+<ul class="Bl-bullet Bl-compact">
+ <li>LSI's 3ware SAS 9750 series</li>
+</ul>
+</section>
+<section class="Sh">
+<h1 class="Sh" id="LOADER_TUNABLES"><a class="permalink" href="#LOADER_TUNABLES">LOADER
+ TUNABLES</a></h1>
+<p class="Pp">Tunables can be set at the <a class="Xr">loader(8)</a> prompt
+ before booting the kernel or stored in <a class="Xr">loader.conf(5)</a>.</p>
+<dl class="Bl-tag">
+ <dt id="hw.tws.cam_depth"><var class="Va">hw.tws.cam_depth</var></dt>
+ <dd>The maximum queued CAM SIM requests for one controller. The default value
+ is 256.</dd>
+ <dt id="hw.tws.enable_msi"><var class="Va">hw.tws.enable_msi</var></dt>
+ <dd>This tunable enables MSI support on the controller if set to a non-zero
+ value. The default value is 0.</dd>
+ <dt id="hw.tws.queue_depth"><var class="Va">hw.tws.queue_depth</var></dt>
+ <dd>The maximum queued requests for one controller.</dd>
+ <dt id="hw.tws.use_32bit_sgls"><var class="Va">hw.tws.use_32bit_sgls</var></dt>
+ <dd>Limit the driver to use only 32-bit SG elements regardless whether the
+ operating system is running in 64-bit mode. The default value is 0.</dd>
+</dl>
+</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/da?</span></dt>
+ <dd>array/logical disk interface</dd>
+ <dt><span class="Pa">/dev/tws?</span></dt>
+ <dd>management interface</dd>
+</dl>
+</section>
+<section class="Sh">
+<h1 class="Sh" id="DIAGNOSTICS"><a class="permalink" href="#DIAGNOSTICS">DIAGNOSTICS</a></h1>
+<p class="Pp">Whenever the driver encounters a command failure, it prints out an
+ error code in the format: &quot;<code class="Li">ERROR: (&lt;error
+ source&gt;: &lt;error code&gt;):</code>&quot;, followed by a text
+ description of the error. There are other error messages and warnings that
+ the driver prints out, depending on the kinds of errors that it encounters.
+ If the driver is compiled with <code class="Dv">TWS_DEBUG</code> defined, it
+ prints out a whole bunch of debug messages.</p>
+</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">da(4)</a>, <a class="Xr">scsi(4)</a></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">tws</code> driver was written by
+ <span class="An">Manjunath Ranganathaiah</span> for LSI and this manual page
+ was written by <span class="An">Xin LI</span>
+ &lt;<a class="Mt" href="mailto:delphij@FreeBSD.org">delphij@FreeBSD.org</a>&gt;
+ for iXsystems, Inc.</p>
+</section>
+</div>
+<table class="foot">
+ <tr>
+ <td class="foot-date">October 4, 2011</td>
+ <td class="foot-os">FreeBSD 15.0</td>
+ </tr>
+</table>