88 lines
6.5 KiB
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88 lines
6.5 KiB
HTML
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<meta name="DC.Title" content="Example: Use the basic concepts of DDM in an APPN network" />
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<title>Example: Use the basic concepts of DDM in an APPN network</title>
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<body id="rbae5xappn1"><a name="rbae5xappn1"><!-- --></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">Example: Use the basic concepts of DDM in an APPN network</h1>
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<div><p>The Advanced
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Peer-to-Peer Networking<sup>®</sup> (APPN) support of an <span class="keyword">iSeries™ server</span> can
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be used to allow DDM access to systems not directly connected to the local
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server.</p>
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<div class="example"> <div class="fignone" id="rbae5xappn1__rbae5appn1"><a name="rbae5xappn1__rbae5appn1"><!-- --></a><span class="figcap">Figure 1. Use DDM in an APPN
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network</span><br /><div class="imageleft"><img src="rsll116.gif" alt="This figure is described in the text of this section." /></div><br /></div>
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</div>
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<div class="section"><p>Figure 1 in <a href="rbae5dirrel1.htm#rbae5dirrel1">Example: Use the basic concepts of DDM in an APPC network</a> shows
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a program on the Chicago server accessing a file on the New York server. Although
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the servers are shown as directly connected, the same DDM concepts apply if
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the network is configured as shown in the preceding figure. When the DDM file
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CUST021 in the figure is opened on the Chicago server, the APPN support finds
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the remote location named NEWYORK, determines the optimal path through the
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network, and establishes a DDM conversation with that location. Although there
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might be several other servers (network nodes) forwarding the data between
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CHICAGO and NEWYORK, the source DDM and target DDM function as if there were
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a direct connection between these two servers.</p>
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</div>
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<div class="section"><p>If the file CUSTMAST were moved from NEWYORK to some other server
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in the network (for example, DALLAS), then in this example, the DDM file at
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CHICAGO needs to be changed. The remote location name would be changed from
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NEWYORK to DALLAS. If a large number of servers in the network refer to the
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file CUSTMAST, then movement of the file results in a change to the DDM file
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at each of these servers. By using the <span class="keyword">iSeries</span> capability
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to have multiple local location names, maintenance of these files is reduced.</p>
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</div>
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<div class="section"><p>In the preceding figure, the server NEWYORK can be given two local
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location names, NEWYORK and FILELOC. The DDM file at CHICAGO uses FILELOC
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as the remote location name. When access to file CUSTMAST is required, APPN
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finds the location FILELOC in the system named NEWYORK, and the DDM conversation
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is established as before.</p>
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</div>
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<div class="section"><p>If the file CUSTMAST is now moved from NEWYORK to DALLAS, the
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user at NEWYORK deletes the local location FILELOC from his server, and it
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is added to the server at DALLAS. This is done by using the APPN local location
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list. When the program in CHICAGO now attempts to access the file CUSTMAST,
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the APPN support finds the remote location FILELOC at the server in Dallas,
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and the DDM conversation is established to that server. The movement of CUSTMAST
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did not result in a change to the DDM file at CHICAGO.</p>
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</div>
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<div class="section"><p>This example shows the concept of multiple local locations and
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how reduced maintenance results when files are moved from one server to another.
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The example is not intended to suggest that a unique location name should
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be used for every file accessed through DDM. The decision of which files should
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be associated with separate local locations should be based on such factors
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as the movement of these files and the number of remote servers accessing
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these files.</p>
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</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="rbae5partfile.htm" title="A system object with type *FILE exists on the source server to identify a remote file. It combines the characteristics of a device file and a database file. As a device file, the DDM file refers to a remote location name, local location name, device name, mode, and a remote network ID to identify a remote server as the target server. The DDM file appears to the application program as a database file and serves as the access device between a source server program and a remote file.">Parts of DDM: DDM file</a></div>
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