72 lines
5.1 KiB
HTML
72 lines
5.1 KiB
HTML
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<meta name="DC.Title" content="Tune cluster performance" />
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<meta name="abstract" content="Since potentially significant differences exist in your communications environment, you have the capability to adjust variables that affect cluster communications to best match your environment." />
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<title>Tune cluster performance</title>
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</head>
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<body id="rzaigmanagetune"><a name="rzaigmanagetune"><!-- --></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">Tune cluster performance</h1>
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<div><p>Since potentially significant differences exist in your communications
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environment, you have the capability to adjust variables that affect cluster
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communications to best match your environment.</p>
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<p>The default values should normally be acceptable to most common environments.
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If your particular environment is not well suited for these defaults, you
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can tune cluster communications to better match your environment. Two levels
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of tuning are available.</p>
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<div class="section"><h4 class="sectiontitle">Base-level tuning</h4><p>Base-level tuning allows you to
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set the tuning parameters to a predefined set of values identified for high,
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low, and normal timeout and messaging interval values. When the normal level
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is selected, the default values are used for cluster communications performance
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and configuration parameters. Selecting the low level causes clustering to
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increase the heartbeating interval and the various message timeout values.
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With fewer heartbeats and longer timeout values, the cluster will be less
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sensitive to communications failures. Selecting the high level causes clustering
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to decrease the heartbeating interval and the various message timeout values.
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With more frequent heartbeats and shorter timeout values, the cluster will
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be more sensitive to communications failures.</p>
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</div>
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<div class="section"><h4 class="sectiontitle">Advanced-level tuning</h4><p>Advanced-level tuning is also
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available such that individual parameters may be tuned over predefined ranges
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of values. This allows more granular tuning to meet any special circumstances
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in your communications environment. If an advanced level of tuning is desired,
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it is recommended that you obtain help from IBM<sup>®</sup> support personnel or equivalent. Setting
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the individual parameters incorrectly can easily result in decreased performance.</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="rzaigmanageclusterperformance.htm" title="When changes are made to a cluster, the overhead necessary to manage the cluster can be affected.">Cluster performance</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="rzaigmanagetunablecommparameters.htm" title="The Change Cluster Resource Services (QcstChgClusterResourceServices) API enables some of the cluster topology services and cluster communications performance and configuration parameters to be tuned to better suit the many unique application and networking environments in which clustering occurs. This API is available to any cluster that is running at cluster version 2 or later.">Tunable cluster communications parameters</a></div>
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</div>
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<div class="relref"><strong>Related reference</strong><br />
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<div><a href="../apis/clcntchgcrs.htm">Change Cluster Resource Services (QcstChgClusterResourceServices) API</a></div>
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</div>
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