80 lines
4.7 KiB
HTML
80 lines
4.7 KiB
HTML
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<!DOCTYPE html
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PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<meta name="DC.Title" content="Communications requirements" />
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<link rel="stylesheet" type="text/css" href="./ibmdita.css" />
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<title>Communications requirements</title>
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</head>
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<body id="rzalycommunications"><a name="rzalycommunications"><!-- --></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">Communications requirements</h1>
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<div><p>Depending on how you plan to use independent disk pools, you must satisfy
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the following communications requirements:</p>
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<div class="section"><h4 class="sectiontitle">Single-system environment</h4>There are no communications
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requirements.</div>
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<div class="section"><h4 class="sectiontitle">Multisystem clustered environment </h4><div class="p">Switchable independent disk pools and independent disk pools
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that are geographically mirrored are configured within an iSeries™ cluster.
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The communication requirements include the following:<ul><li><span class="uicontrol">For switchable independent disk
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pools</span>, at least one TCP/IP communications interface between the
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servers in the cluster. For redundancy, it is recommended that there be at
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least two separate interfaces between the servers. </li>
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<li><span class="uicontrol">For geographic mirroring</span>,
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the following are recommended: <ul><li>Up to a maximum of four unique TCP/IP addresses,
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used exclusively for geographic mirroring. Geographic mirroring can generate
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heavy communications traffic. If geographic mirroring shares the same IP
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connection with another application, for example clustering, then geographic
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mirroring might be suspended which results in synchronization. Likewise,
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clustering response might be unacceptable which results in partitioned nodes.</li>
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<li>Throughput for each data port connection should match, meaning that the
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speed and connection type should be the same for all connections between server
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pairs. If throughput is different, performance will be gated by the slowest
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connection. </li>
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</ul>
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<p>Consider configuring a <a href="../rzaja/rzajagetstart.htm">virtual private network</a> for TCP/IP connections for the
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following advantages:</p>
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<ul><li>Security of data transmission by encrypting the data </li>
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<li>Increased reliability of data transmission by sending greater redundancy</li>
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</ul>
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</li>
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</ul>
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</div>
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</div>
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<div class="section"><h4 class="sectiontitle">Connections from the production system </h4>Geographic
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mirroring will establish connections from the production system to each of
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the data port TCP/IP addresses on the mirror copy. TCP can choose to connect
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from any available TCP/IP address on the production system according to the
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TCP routing table. The TCP address used is not limited to the addresses configured
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for geographic mirroring on the production system. TCP may select the same
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TCP/IP address on the production system to connect to each TCP/IP address
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on the mirror copy. To control which TCP/IP address(es) on the production
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system are used to connect to each address on the mirror copy, TCP/IP routes
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can be created. This is useful to control which addresses on the production
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system will be chosen for geographic mirroring. It can also eliminate a single
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point of failure and potential bottleneck caused when all connections are
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created from the same TCP/IP address.</div>
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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="rzalyplan.htm">Plan for independent disk pools</a></div>
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</div>
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</div>
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</body>
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</html> |