95 lines
5.8 KiB
HTML
95 lines
5.8 KiB
HTML
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<?xml version="1.0" encoding="UTF-8"?>
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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="Prevent loss of auditing information" />
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<meta name="abstract" content="This article describes which information to look for to prevent loss of auditing information." />
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<meta name="description" content="This article describes which information to look for to prevent loss of auditing information." />
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<title>Prevent loss of auditing information</title>
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</head>
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<body id="preventlossauditinfo"><a name="preventlossauditinfo"><!-- --></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">Prevent loss of auditing information</h1>
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<div><p>This article describes which information to look for to prevent
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loss of auditing information.</p>
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<p>Two system values control what the system does when error conditions may
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cause the loss of audit journal entries. </p>
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<p><strong>Audit Force Level:</strong> The QAUDFRCLVL system value determines how often
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the system writes audit journal entries from memory to auxiliary storage.
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The QAUDFRCLVL system value works like the force level for database files.
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You should follow similar guidelines in determining the correct force level
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for your installation. </p>
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<p>If you allow the system to determine when to write entries to auxiliary
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storage, it balances the performance impact against the potential loss of
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information in a power outage. *SYS is the default and the recommended choice. </p>
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<p>If you set the force level to a low number, you minimize the possibility
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of losing audit records, but you may notice a negative performance impact.
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If your installation requires that no audit records be lost in a power failure,
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you must set the QAUDFRCLVL to <kbd class="userinput">1</kbd>. </p>
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<div class="p"><strong>Audit End Action:</strong> The QAUDENDACN system value determines what the
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system does if it is unable to write an entry to the audit journal. The default
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value is *NOTIFY. The system does the following if it is unable to write audit
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journal entries and QAUDENDACN is *NOTIFY: <ol><li>The QAUDCTL system value is set to *NONE to prevent additional attempts
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to write entries.</li>
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<li>Message CPI2283 is sent to the QSYSOPR message queue and the QSYSMSG message
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queue (if it exists) every hour until auditing is successfully restarted.</li>
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<li>Normal processing continues.</li>
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<li>If an IPL is performed on the system, message CPI2284 is sent to the QSYSOPR
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and QSYSMSG message queues during the IPL.</li>
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</ol>
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</div>
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<div class="note"><span class="notetitle">Note:</span> In most cases, performing an IPL resolves the problem that
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caused auditing to fail. After you have restarted your system, set the QAUDCTL
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system value to the correct value. The system attempts to write an audit journal
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record whenever this system value is changed.</div>
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<div class="p">You can set the QAUDENDACN to power down your system if auditing fails
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(*PWRDWNSYS). Use this value only if your installation requires that auditing
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be active for the system to run. If the system is unable to write an audit
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journal entry and the QAUDENDACN system value is *PWRDWNSYS, the following
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happens: <ol><li>The system powers down immediately (the equivalent of issuing the PWRDWNSYS
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*IMMED command).</li>
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<li>SRC code <samp class="codeph">B900 3D10</samp> is displayed.</li>
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</ol>
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</div>
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<div class="p">Next, you must do the following: <ol><li>Start an IPL from the system unit. Make sure that the device specified
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in the system console (QCONSOLE) system value is powered on.</li>
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<li>To complete the IPL, a user with *ALLOBJ and *AUDIT special authority
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must sign on at the console.</li>
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<li>The system starts in a restricted state with a message indicating that
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an auditing error caused the system to stop.</li>
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<li>The QAUDCTL system value is set to *NONE.</li>
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<li>To restore the system to normal, set the QAUDCTL system value to a value
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other than <kbd class="userinput">NONE</kbd>. <p>When you change the QAUDCTL system
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value, the system attempts to write an audit journal entry. If it is successful,
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the system returns to a normal state. If the system does not successfully
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return to a normal state, use the job log to determine why auditing has failed.
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Correct the problem and attempt to reset the QAUDCTL value again.</p>
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</li>
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</ol>
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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="rzamvmonitorsec.htm" title="This set of topics discuss various techniques for monitoring and auditing security on your system.">Monitor security</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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