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6.1 KiB
HTML
94 lines
6.1 KiB
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<meta name="DC.Title" content="Communications in the QFileSvr.400 file system" />
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<meta name="abstract" content="The QFileSvr.400 file system communicates in the following ways." />
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<title>Communications in the QFileSvr.400 file system</title>
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<body id="rzaaxos4comm"><a name="rzaaxos4comm"><!-- --></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 in the QFileSvr.400 file system</h1>
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<div><p><span>The QFileSvr.400 file system communicates
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in the following ways.</span></p>
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<div class="section"><ul><li>TCP connections with the file server on a target server can be established
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only if the QSERVER subsystem on the target server is active.</li>
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<li>SNA LU 6.2 connections are attempted only if there is a locally controlled
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session that is not in use (for example, a session specifically established
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for use by the LU 6.2 connection). When establishing LU 6.2 connections,
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the QFileSvr.400 file system uses a mode of BLANK. On the target system, a
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job named QPWFSERV is submitted to the QSERVER subsystem. The user profile
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of this job is defined by the communications entry for the BLANK mode. For
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more information about LU 6.2 communications, see <a href="../books/sc415443.pdf" target="_blank">APPC Programming</a> <img src="wbpdf.gif" alt="Link to PDF" />.
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</li>
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<li>File server requests that use TCP as the communications protocol are performed
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within the context of the job that is issuing the request. File server requests
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that use SNA as the communications protocol are performed by the <span class="keyword">i5/OS™</span> system job Q400FILSVR.</li>
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<li>If a connection is not yet established with the target server,
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the QFileSvr.400 file system assumes that the first-level directory represents
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a TCP/IP host name. The QFileSvr.400 file system goes through the following
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steps to establish a connection with the target server: <ol><li>Resolve the remote location name to an IP address.</li>
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<li>Connect to the host server's server mapper on well-known port 449 using
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the resolved IP address. Then send a query to the server mapper for the service
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name <span class="q">"as-file."</span> One of the following occurs as result of the query: <ul><li>If <span class="q">"as-file"</span> is in the service table on the target server, the server
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mapper returns the port on which the <span class="keyword">i5/OS</span> file
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server daemon is listening.</li>
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<li>If the server mapper is not active on the target server, the default port
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number for <span class="q">"as-file"</span> (8473) is used.</li>
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</ul>
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<p>The QFileSvr.400 file system then tries to establish a TCP connection
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with the <span class="keyword">i5/OS</span> file server
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daemon on the target server. When the connection is established, QFileSvr.400
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exchanges requests and replies with the file server. Within the QSERVER subsystem,
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the QPWFSERVSO prestart requests take control of the connection. Each prestart
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job runs under its own user profile.</p>
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</li>
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<li>If the remote location name is not resolved to an IP address, the first-level
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directory is assumed to be an SNA LU 6.2 name. Therefore, an attempt is made
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to establish an APPC connection with the <span class="keyword">i5/OS</span> file
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server.</li>
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</ol>
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</li>
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<li>The QFileSvr.400 file system periodically (every 2 hours) checks to determine
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if there are any connections that are not being used (for example, no opened
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files associated with the connection) and those connections had no activity
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during a 2-hour period. If such a connection is found, the connection is ended.</li>
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<li>The QFileSvr.400 file system cannot detect loops. The following path name
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is an example of a loop: <pre> /QFileSvr.400/Remote2/QFileSvr.400/Remote1/QFileSvr.400/Remote2/...</pre>
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<p>where <samp class="codeph">Remote1</samp> is the local system. When the path name that contains a loop is specified,
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the QFileSvr.400 file system returns an error after a brief period of time.
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The error indicates that a time-out has occurred.</p>
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<p>The QFileSvr.400
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file system will use an existing free session when communicating over SNA.
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It is necessary to start the mode and establish a session for the QFileSvr.400
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to successfully connect to the remote communications system.</p>
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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>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="rzaaxrfsfs.htm" title="The QFileSvr.400 file system provides transparent access to other file systems that reside on remote iSeries servers. It is accessed through a hierarchical directory structure.">i5/OS file server file system (QFileSvr.400)</a></div>
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</div>
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</div>
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</body>
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</html>
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