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<h1 class="topictitle1">Restart system values: Controlling subsystem/library</h1>
<div><p>Specifies the controlling subsystem and the library. (QCTLSBSD)</p>
<p><span class="uicontrol">Controlling subsystem/library</span>, also known as <span class="uicontrol">QCTLSBSD</span>,
is a member of the restart category of i5/OS™ system values. You can use this system
value to specify the controlling subsystem and the library. To learn more,
keep reading.</p>
<div class="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" frame="border" border="1" rules="all"><thead align="left"><tr><th colspan="2" valign="top" class="firstcol" id="d0e31">Quick reference</th>
</tr>
</thead>
<tbody><tr><th valign="top" class="firstcol" id="d0e35" headers="d0e31 ">Location</th>
<td valign="top" headers="d0e35 d0e31 ">In iSeries™ Navigator,
select your system, <span class="menucascade"><span class="uicontrol"></span> &gt; <span class="uicontrol">Configuration
and Service</span> &gt; <span class="uicontrol">System Values</span> &gt; <span class="uicontrol">Restart</span> &gt; <span class="uicontrol">Setup</span></span></td>
</tr>
<tr><th valign="top" class="firstcol" id="d0e53" headers="d0e31 ">Special authority</th>
<td valign="top" headers="d0e53 d0e31 ">None</td>
</tr>
<tr><th valign="top" class="firstcol" id="d0e58" headers="d0e31 ">Default value</th>
<td valign="top" headers="d0e58 d0e31 ">Controlling subsystem - QBASE; Library - QSYS</td>
</tr>
<tr><th valign="top" class="firstcol" id="d0e63" headers="d0e31 ">Changes take effect</th>
<td valign="top" headers="d0e63 d0e31 ">At the next restart of the system</td>
</tr>
<tr><th valign="top" class="firstcol" id="d0e68" headers="d0e31 ">Lockable</th>
<td valign="top" headers="d0e68 d0e31 ">No</td>
</tr>
</tbody>
</table>
</div>
<div class="section"><h4 class="sectiontitle">What can I do with this system value?</h4><p>You may specify
the first subsystem to start after you restart the system. One subsystem must
be active while the system is running. This is the controlling subsystem.
Other subsystems can be started and stopped.</p>
<p>If this subsystem description
cannot be used (for example, it is damaged), the backup subsystem description
QSYSSBSD in the library QSYS can be used. A subsystem description specified
as the controlling subsystem cannot be deleted or renamed once the system
is fully operational.</p>
<p>The subsystem description must exist in the system
disk pool (also known as auxiliary storage pool) or in a basic user disk.</p>
</div>
<div class="section"><h4 class="sectiontitle">Where can I get more information about this system value?</h4><p>To
learn more, go to the restart system values overview topic. If you are looking
for a specific system value or category of system values, try using the i5/OS system
value finder.</p>
</div>
</div>
<div><div class="relconcepts"><strong>Related concepts</strong><br />
<div><a href="rzakzrestartoverview.htm" title="Use restart system values to change and view when to restart the system and what will happen when the system is restarted.">System values: Restart overview</a></div>
</div>
<div class="relinfo"><strong>Related information</strong><br />
<div><a href="rzakzfinder.htm">System value finder</a></div>
</div>
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