68 lines
4.6 KiB
HTML
68 lines
4.6 KiB
HTML
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<meta name="DC.Title" content="IPL considerations for uninterruptible power supply" />
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<meta name="abstract" content="When the system performs an IPL, the Licensed Internal Code verifies various internal switches to see if the system was correctly powered down." />
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<title>IPL considerations for uninterruptible power supply</title>
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<body id="rzahrcnsdsco"><a name="rzahrcnsdsco"><!-- --></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">IPL considerations for uninterruptible power supply</h1>
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<div><p>When the system performs an IPL, the Licensed Internal Code verifies
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various internal switches to see if the system was correctly powered down.</p>
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<p>Only the successful completion of the Power Down System (PWRDWNSYS) command
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causes the system to be correctly powered down. For any other type of shutdown,
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the i5/OS™ program
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considers the next IPL to be abnormal. The Licensed Internal Code considers
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the IPL to be normal if the system saves main storage and completes the power-down
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sequence successfully. If neither power-down technique completes normally,
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the Licensed Internal Code runs various recovery functions on the next IPL.</p>
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<p>When an abnormal IPL occurs, the i5/OS program performs additional recovery
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functions. In an attended IPL, you can control some of these functions. In
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an unattended IPL that is caused by the Power restore IPL system value (QPWRRSTIPL)
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or a timed IPL, the system can only use the values that are currently set.</p>
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<p>If the Power Down System (PWRDWNSYS) command is run while power is supplied
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by the Battery Backup Unit (BBU) or uninterruptible power supply, the system
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delays writing any job logs until the next IPL. The system handles this type
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of PWRDWNSYS so that the amount of processing is minimized. The system does
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not perform an IPL while operating on the BBU.</p>
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<p>You can perform an IPL on the system if utility power is off and the system
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is operating on an uninterruptible power supply. This does not apply for a
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timed or remote IPL. Only a manually initiated IPL is allowed when utility
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power is interrupted.</p>
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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="rzahrconcepts.htm" title="Before you use a power-handling program to control system shutdown, you may want to familiarize yourself with related concepts.">Controlled shutdown concepts</a></div>
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</div>
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<div class="relconcepts"><strong>Related concepts</strong><br />
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<div><a href="rzahrpwrrstco.htm" title="This value controls what happens if the system ends when utility power is interrupted and then restored at a later time.">Power restore IPL system value (QPWRRSTIPL)</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="rzahrupsmsgrf.htm" title="Use this topic to learn about error messages related to uninterruptible power supply.">Uninterruptible power supply messages</a></div>
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