Vijay Adik vadik@us - IBM
Vijay Adik vadik@us - IBM
Vijay Adik vadik@us - IBM
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33<br />
Advanced Technical Support – System p<br />
CPU Considerations<br />
� Use SMT with AIX 5.3/Power5 (or later) environments<br />
� Micro-partitioning Guidelines<br />
– Virtual CPUs = capping limit<br />
UNCAPPED<br />
– Virtual CPUS should be set to the max peak demand requirement<br />
– Entitlement >= Virtual CPUs / 3<br />
� DLPAR considerations<br />
Oracle 9i<br />
– Oracle CPU_COUNT does not recognize change in # cpus<br />
– AIX scheduler can still use the added CPUs<br />
Oracle 10g<br />
– Oracle CPU_COUNT recognizes change in # cpus<br />
� Max CPU_COUNT limited to 3x CPU_COUNT at instance startup<br />
© 2009 <strong>IBM</strong> Corporation<br />
April 17, 2009
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