83 lines
5.7 KiB
HTML
83 lines
5.7 KiB
HTML
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<meta name="DC.Title" content="Logical partition concept: shared processor pool" />
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<meta name="abstract" content="The shared processing pool allows you to assign partial processors to a logical partition." />
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<title>Logical partition concept: shared processor pool</title>
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</head>
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<body id="rzaitshareproc"><a name="rzaitshareproc"><!-- --></a>
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<!-- Java sync-link --><script language="Javascript" src="../rzahg/synch.js" type="text/javascript"></script>
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<h1 class="topictitle1">Logical partition concept: shared processor pool</h1>
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<div><p>The shared processing pool allows you to assign partial processors
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to a logical partition.</p>
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<p>The physical processors are held in the shared processing pool and are
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shared among the logical partitions. A minimum of 0.10 processing units can
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be configured for any partition using shared processors. The primary partition
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may require more than 0.10 processing units when starting secondary partitions,
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otherwise timeout conditions may occur with resources communicating directly
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with the primary partition. Each system processing capacity and partition
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configuration needs to be evaluated to determine reasonable processor units
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for primary and secondary partitions.</p>
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<p>Virtual processors are the whole number of concurrent operations which
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the operating system can utilize. The processing power can be conceptualized
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as being spread equally across these virtual processors. Selecting the optimal
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number of virtual processors is dependent on the workload in the partition:
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some benefit from greater concurrence, others require greater power. It is
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recommended to keep a balance of virtual processors to processors units. If
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less than or equal to 1.00 processing units are specified, 1 virtual processor
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should be used. Likewise, if less than or equal to 2.00 processing units are
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specified, 2 virtual processors should be used. If an imbalance of processing
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units and virtual processors occurs, partition batch performance may be degraded.</p>
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<p>To accommodate changing workloads, you can adjust shared processing units
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within the minimum/maximum values you establish without needing to restart
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the partition. These values enable you to establish a range within which you
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can dynamically move resources without needing to restart the logical partition.
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When you change the minimum/maximum values, you must restart the partition.
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Minimum values dictate what is required to restart the partition. If the minimum
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value is not met for all logical partitions, only the primary will restart.</p>
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<p><br /><img src="rzait518.gif" alt="Picture showing iSeries partitioned using the shared processing pool." /><br /></p>
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<p>For example, a system with 4 processors in the shared pool provides 4.00
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processing units. Five logical partitions could distribute the processing
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power in the following way: Partition 0 has 2.00 processing units and 2 virtual
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processors, partition 1 has 0.50 processing units and 1 virtual processor,
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partition 2 has 0.50 processing units and 1 virtual processor, partition 3
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has 0.75 processing units and 1 virtual processor, and partition 4 has 0.25
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processing units and 1 virtual processor. The sum of the 5 logical partition's
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processing units is less than or equal to the total number of processing units
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in the shared pool. But the total number of virtual processors is 6.</p>
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</div>
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<div>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="rzaitprocessor.htm" title="A processor is a device that executes programmed instructions.">Logical partition concept: Processor</a></div>
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</div>
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<div class="relconcepts"><strong>Related concepts</strong><br />
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<div><a href="rzaitchoosenumber.htm" title="The number of processors you want to add to a logical partition depends on the planned workload for the partition and the desired level of performance.">Determine the possible number of logical partitions</a></div>
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</div>
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<div class="reltasks"><strong>Related tasks</strong><br />
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<div><a href="rzaithardwarereq.htm" title="Understand the basic hardware concepts and requirements to partition your server.">Hardware for logical partitions</a></div>
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</div>
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</div>
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</body>
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