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<h1 class="topictitle1">Create a controlling subsystem</h1>
<div><p>IBM<sup>®</sup> supplies
two complete controlling subsystem configurations: QBASE (the default controlling
subsystem), and QCTL. Only one controlling subsystem can be active on the
system at one time. Typically, the IBM supplied subsystem configurations should
be sufficient for most business needs. However, you can create your own version
of a controlling subsystem and configure it to more closely meet your company's
unique needs.</p>
<div class="p">Use the IBM-supplied controlling subsystem QBASE or QCTL as a model
for creating your own controlling subsystem.<div class="note"><span class="notetitle">Note:</span> If you create your own controlling
subsystem, you should use a name other than QBASE or QCTL.</div>
</div>
<div class="section">The subsystem description for the controlling subsystem should contain
the following:<ul><li>A routing entry containing:<blockquote><ul><li>Either *ANY or QCMDI as routing data</li>
<li>QSYS/QCMD as the program to be called</li>
<li>Class QSYS/QCTL or a user-defined class. (This is because a user, typically
the system operator, must be able to enter commands to do such things as free
up storage if the auxiliary storage threshold has been reached.)</li>
</ul>
</blockquote>
</li>
<li>A workstation entry for the console with a type of *SIGNON (*SIGNON is
a value for the AT<sup>®</sup> parameter,
specified on the Add Work Station Entry (<span class="cmdname">ADDWSE</span>) command.)<blockquote>The
*SIGNON value indicates that the signon display is displayed at the workstation
when the subsystem is started. This requirement ensures that the subsystem
has an interactive device for entry of system and subsystem level commands.
The End System (<span class="cmdname">ENDSYS</span>) command ends the iSeries™ licensed
program to a single session (or signon display) at the console in the controlling
subsystem. A subsystem description that does not contain a workstation entry
for the console cannot be started as a controlling subsystem.</blockquote>
</li>
<li>An entry for another workstation: <blockquote>This provides an alternative source
of controlling input. If a console problem is detected during an attended
IPL and the If console problem occurs (QSCPFCONS) system value is set to '1',
the IPL will continue in unattended mode. Then, if the subsystem description
for the controlling subsystem contains a workstation entry for another workstation,
that alternate workstation can be used.</blockquote>
</li>
<li>A routing entry containing:<blockquote><ul><li>QSYS/QARDRIVE as the program to be called,</li>
<li>and QSYS/QCTL as the class</li>
</ul>
</blockquote>
</li>
</ul>
</div>
<div class="section">After you have created the controlling subsystem, change the Controlling
subsystem/library (QCTLSBSD) system value as follows (assuming the description
is named QGPL/QCTLA):<blockquote><pre>CHGSYSVAL SYSVAL(QCTLSBSD) VALUE('QCTLA QGPL')</pre>
</blockquote>
The
change becomes effective at the next IPL. </div>
</div>
<div>
<div class="familylinks">
<div class="parentlink"><strong>Parent topic:</strong> <a href="rzaksmanagesbs1.htm" title="Because jobs run in subsystems, you might need to monitor subsystem activity for potential problems that can affect a job's ability to run.">Manage subsystems</a></div>
</div>
<div class="relconcepts"><strong>Related concepts</strong><br />
<div><a href="rzakscontrollingsbs.htm" title="The controlling subsystem is the interactive subsystem that starts automatically when the system starts, and it is the subsystem through which the system operator controls the system via the system console. It is identified in the Controlling subsystem/library (QCTLSBSD) system value.">The controlling subsystem</a></div>
</div>
<div class="relinfo"><strong>Related information</strong><br />
<div><a href="../experience/wmrstateabstract53.htm">Experience Report: Restricted State</a></div>
</div>
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