107 lines
7.8 KiB
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107 lines
7.8 KiB
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<title>Find first-failure data capture data</title>
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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">Find first-failure data capture data</h1>
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<div><p>This topic describes tips on how to locate first-failure data capture
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(FFDC) data on an <span class="keyword">iSeries™ server</span>.
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The information is most useful if the failure causing the FFDC data output
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occurred on the application server (AS). The FFDC data for an application
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requester (AR) can usually be found in one of the spooled files associated
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with the job running the application program.</p>
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<div class="section"><div class="note"><span class="notetitle">Note:</span> No FFDC data is produced unless the QSFWERRLOG system value
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is set to *LOG.</div>
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</div>
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<ol><li class="stepexpand"><span>Execute a <span class="cmdname">Display Messages (DSPMSG)</span> QSYSOPR
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command and look for a <samp class="codeph">Software problem detected in Qccxyyyy</samp> message
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in the QSYSOPR message log. (<samp class="codeph">cc</samp> in the program name is usually
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RW, but could be CN or SQ.) The presence of this message indicates that FFDC
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data was produced. You can use the help key to get details on the message.
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The message help gives you the problem ID, which you can use to identify the
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problem in the list presented by the <span class="cmdname">Work with Problems (WRKPRB)</span> command.
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You might be able to skip this step because the problem record, if it exists,
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might be at or near the top of the list.</span></li>
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<li class="stepexpand"><span>Enter the <span class="cmdname">Work with Problems (WRKPRB)</span> command
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and specify the program name (Qccxyyyy) from the <samp class="codeph">Software problem
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detected in Qccxyyyy</samp> message. Use the program name to filter out
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unwanted list items. When a list of problems is presented, specify option
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5 on the line containing the problem ID to get more problem details, such
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as symptom string and error log ID.</span></li>
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<li class="stepexpand"><span>When you have the error log ID, enter the <span class="cmdname">Start System
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Service Tools (STRSST)</span> command.</span> On the first screen,
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select <samp class="codeph">Start a service tool</samp>. On the next screen, enter 1
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to select <samp class="codeph">Error log utility</samp>. On the next screen, enter 2
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to select <samp class="codeph">Display or print by error log ID</samp>. In the next screen,
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you can:<ul><li>Enter the error log ID.</li>
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<li>Enter Y to get the hexadecimal display.</li>
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<li>Select the Print or Display option.</li>
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</ul>
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</li>
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</ol>
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<div class="section"> <p>The Display option gives 16 bytes per line instead of 32. This
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can be useful for online viewing and printing screens on an 80-character workstation
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printer. If you choose the Display option, use F6 to see the hexadecimal data
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after you press Enter.</p>
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<p>The hexadecimal data contains the first one KB
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of the FFDC dump data, preceded by some other data. The start of the FFDC
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data is identified by the FFDC data index. The name of the target job (if
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this is on the application server) is before the data index. If the FFDC dump
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spool file has not been deleted, use this fully qualified job name to find
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the spool file. If the spool file is missing, either:</p>
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<ul><li>Use the first one KB of the dump stored in the error log.</li>
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<li>Re-create the problem if the one KB of FFDC data is insufficient.</li>
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</ul>
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<p>When interpreting FFDC data from the error log, the FFDC data in the
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error log is not formatted for reading as well as the data in the spooled
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files. Each section of the FFDC dump in the error log is prefixed by a four-byte
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header. The first two bytes of the header are the length of the following
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section (not counting the prefix). The second two bytes, which are the section
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number, correspond to the section number in the index.</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="rbal1problem.htm" title="When a problem occurs accessing a distributed relational database, it is the job of the administrator to determine the nature of the problem and whether it is a problem with the application or a problem with the local or remote system.">Troubleshooting</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="rbal1fdodes.htm" title="This information describes the data areas and types of information available in a first-failure data capture (FFDC) dump output.">FFDC dump output description</a></div>
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</div>
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<div class="relinfo"><strong>Related information</strong><br />
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<div><a href="../cl/dspmsg.htm">Display Messages (DSPMSG) command</a></div>
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<div><a href="../cl/wrkprb.htm">Work with Problem (WRKPRB) command</a></div>
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<div><a href="../cl/strsst.htm">Start System Service Tools (STRSST) command</a></div>
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</div>
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</div>
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