62 lines
4.5 KiB
HTML
62 lines
4.5 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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<html lang="en-us" xml:lang="en-us">
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<head>
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<meta name="DC.Type" content="concept" />
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<meta name="DC.Title" content="Power loss controlled shutdown" />
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<meta name="abstract" content="The power loss-controlled shutdown mechanism allows the system to shut down in an orderly fashion following a loss of utility power. The power loss-controlled shutdown mechanism is available only if you connected the system to an uninterruptible power supply." />
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<meta name="description" content="The power loss-controlled shutdown mechanism allows the system to shut down in an orderly fashion following a loss of utility power. The power loss-controlled shutdown mechanism is available only if you connected the system to an uninterruptible power supply." />
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<meta name="DC.Relation" scheme="URI" content="rzahrconcepts.htm" />
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<meta name="DC.Relation" scheme="URI" content="rzahrupsco.htm" />
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<meta name="DC.Relation" scheme="URI" content="rzahrdlytimco.htm" />
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<meta name="copyright" content="(C) Copyright IBM Corporation 1998, 2006" />
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<meta name="DC.Rights.Owner" content="(C) Copyright IBM Corporation 1998, 2006" />
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<meta name="DC.Format" content="XHTML" />
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<!-- All rights reserved. Licensed Materials Property of IBM -->
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<!-- US Government Users Restricted Rights -->
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<!-- GSA ADP Schedule Contract with IBM Corp. -->
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<link rel="stylesheet" type="text/css" href="./ibmdita.css" />
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<link rel="stylesheet" type="text/css" href="./ic.css" />
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<title>Power loss controlled shutdown</title>
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</head>
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<body id="rzahrctldwnco"><a name="rzahrctldwnco"><!-- --></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">Power loss controlled shutdown</h1>
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<div><p>The power loss-controlled shutdown mechanism allows the system
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to shut down in an orderly fashion following a loss of utility power. The
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power loss-controlled shutdown mechanism is available only if you connected
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the system to an uninterruptible power supply.</p>
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<p>If utility power is not restored within the time that is specified by the
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QUPSDLYTIM system value, the Licensed Internal Code signals each job to end
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at the next instruction boundary. Typically a job is at the next instruction
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boundary or will be shortly. However, some long running instructions, such
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as those that build access paths or create programs, may not complete in the
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time that is allowed. After a fixed internal time to reach an instruction
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boundary, the changed pages in main storage are written to auxiliary storage,
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the system shuts down abnormally, and then powers off.</p>
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<p>Successfully completing a power loss controlled shutdown causes the next
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initial program load (IPL) of the system programs to be considered normal
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by the Licensed Internal Code, but not by the operating system. If the uninterruptible
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power supply batteries do not hold the system long enough for the power loss-controlled
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shutdown to complete, the next IPL will be abnormal from the Licensed Internal
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Code viewpoint.</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="rzahrupsco.htm" title="An uninterruptible power supply provides a source of ac power if utility power should fail. Typically, uninterruptible power supplies have a finite backup time.">Uninterruptible power supply</a></div>
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<div><a href="rzahrdlytimco.htm" title="QUPSDLYTIM is the system value for the Uninterruptible power supply delay timer.">Uninterruptible power supply delay time system value (QUPSDLYTIM)</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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