69 lines
4.1 KiB
HTML
69 lines
4.1 KiB
HTML
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<title>Requirements for geographic mirroring</title>
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</head>
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<body id="rzalyrequirementsforgeographicmirroring"><a name="rzalyrequirementsforgeographicmirroring"><!-- --></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">Requirements for geographic mirroring</h1>
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<div><ul><li>Geographic mirroring increases CPU load, so there must be
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sufficient excess CPU capacity. Add processors as needed to increase CPU capacity.</li>
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<li>For optimal performance for geographic mirroring, particularly
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during synchronization, increase your machine pool size by the amount given
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by the following formula: <p>The amount of extra machine pool storage is:
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271.5 MB + .2MB * Number of disk units in independent ASPs. </p>
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<div class="p">The extra
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machine pool storage is required on the target node. However, because the
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target node changes when doing switchovers and failovers, you should increase
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the machine pool on all nodes in the Cluster Resource Group. To prevent the
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performance adjuster from reducing the machine pool size, you should do one
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of the following:<ol><li>Set the machine pool minimum size to the calculated amount (the current
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size plus the extra size for geographic mirroring from the formula) using <a href="../cl/wrkshrpool.htm">Work with Shared Storage Pools (WRKSHRPOOL)
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command</a> or <a href="../cl/chgshrpool.htm">Change Shared
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Storage Pool (CHGSHRPOOL) command</a>.<div class="note"><span class="notetitle">Note:</span> It is recommended
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to use this option with the Work with Shared Storage Pools (WRKSHRPOOL) option.</div>
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</li>
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<li>Set QPFRADJ to zero which prohibits the performance adjuster from changing
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size of the machine pool.</li>
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</ol>
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</div>
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</li>
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<li>Configure a separate storage pool for the jobs using geographic mirrored
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independent disk pools, especially if you specify a long recovery timeout.</li>
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<li>Geographic mirroring is performed when
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the disk pool is available. When geographic mirroring is being performed,
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the system value for the time of day (<a href="../rzakz/rzakzqtime.htm">QTIME</a>) should not be changed.</li>
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<li>Communications requirements for independent disk pools are particularly
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critical as they affect throughput. See <a href="rzalycommunications.htm">Communications requirements</a> for more information.</li>
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<li>All independent disk pool requirements
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must be met. See <a href="rzalyplan.htm">Plan for independent disk pools</a> for
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more information.</li>
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</ul>
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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="rzalygeographicmirror.htm">Geographic mirroring</a></div>
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</div>
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