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<html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968" /><title>Chapter 4. SCSI lower layer</title><meta name="generator" content="DocBook XSL Stylesheets V1.75.2" /><link rel="home" href="index.html" title="SCSI Interfaces Guide" /><link rel="up" href="index.html" title="SCSI Interfaces Guide" /><link rel="prev" href="re152.html" title="srp_release_transport" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">Chapter 4. SCSI lower layer</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="re152.html">Prev</a> </td><th width="60%" align="center"> </th><td width="20%" align="right"> </td></tr></table><hr /></div><div class="chapter" title="Chapter 4. SCSI lower layer"><div class="titlepage"><div><div><h2 class="title"><a id="lower_layer"></a>Chapter 4. SCSI lower layer</h2></div></div></div><div class="toc"><p><b>Table of Contents</b></p><dl><dt><span class="sect1"><a href="ch04.html#hba_drivers">Host Bus Adapter transport types</a></span></dt><dd><dl><dt><span class="sect2"><a href="ch04.html#scsi_debug.c">Debug transport</a></span></dt><dt><span class="sect2"><a href="ch04.html#todo">todo</a></span></dt></dl></dd></dl></div><div class="sect1" title="Host Bus Adapter transport types"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a id="hba_drivers"></a>Host Bus Adapter transport types</h2></div></div></div><div class="toc"><dl><dt><span class="sect2"><a href="ch04.html#scsi_debug.c">Debug transport</a></span></dt><dt><span class="sect2"><a href="ch04.html#todo">todo</a></span></dt></dl></div><p>
Many modern device controllers use the SCSI command set as a protocol to
communicate with their devices through many different types of physical
connections.
</p><p>
In SCSI language a bus capable of carrying SCSI commands is
called a "transport", and a controller connecting to such a bus is
called a "host bus adapter" (HBA).
</p><div class="sect2" title="Debug transport"><div class="titlepage"><div><div><h3 class="title"><a id="scsi_debug.c"></a>Debug transport</h3></div></div></div><p>
The file drivers/scsi/scsi_debug.c simulates a host adapter with a
variable number of disks (or disk like devices) attached, sharing a
common amount of RAM. Does a lot of checking to make sure that we are
not getting blocks mixed up, and panics the kernel if anything out of
the ordinary is seen.
</p><p>
To be more realistic, the simulated devices have the transport
attributes of SAS disks.
</p><p>
For documentation see
<a class="ulink" href="http://www.torque.net/sg/sdebug26.html" target="_top">http://www.torque.net/sg/sdebug26.html</a>
</p></div><div class="sect2" title="todo"><div class="titlepage"><div><div><h3 class="title"><a id="todo"></a>todo</h3></div></div></div><p>Parallel (fast/wide/ultra) SCSI, USB, SATA,
SAS, Fibre Channel, FireWire, ATAPI devices, Infiniband,
I20, iSCSI, Parallel ports, netlink...
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