ibm-information-center/dist/eclipse/plugins/i5OS.ic.rzahq_5.4.0.1/rzahqmprrf.htm

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<title>Machine pool size requirements</title>
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<h3 id="rzahqmprrf">Machine pool size requirements</h3>
<p>The machine memory pool is used for highly-shared machine and operating
system programs. The machine memory pool provides storage for jobs the system
must run that do not require your attention. If you set the size for these
storage pools too small, you will impair system performance. You cannot set
QMCHPOOL to less than 256 KB. The size for this memory pool is specified in
the machine memory pool size system value (QMCHPOOL). No user jobs run in
this memory pool.</p>
<p><img src="delta.gif" alt="Start of change" />All supported IXS and IXA attached integrated server hardware
requires a minimum 856KB of memory. For information about iSCSI attached server
memory requirements, see <a href="http://www.ibm.com/servers/eserver/iseries/integratedxseries/iscsireadme" target="_blank">iSCSI install read me first</a>
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<p>You can display or change the machine pool size by using the Work With
System Status (WRKSYSSTS) command. The first storage pool on the WRKSYSSTS
display is the machine pool.</p>
<p>You can change the system value QPFRADJ so that the system automatically
adjusts system pool sizes. However, because automatic performance adjustment
can slow down a busy system, you probably want to limit its use to one of
these times:</p>
<ul>
<li>The first couple days after the installation</li>
<li>An hour or so at the time your system load changes from daytime (interactive
emphasis) to nighttime (batch emphasis) and back</li></ul>
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