78 lines
5.3 KiB
HTML
78 lines
5.3 KiB
HTML
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<meta name="DC.Title" content="Time zone considerations for Collection Services" />
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<meta name="abstract" content="When you review and analyze performance data, the actual local time of the collection can be significant." />
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<title>Time zone considerations for Collection Services</title>
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</head>
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<body id="rzahx3b6"><a name="rzahx3b6"><!-- --></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">Time zone considerations for Collection Services</h1>
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<div><p>When you review and analyze performance data, the actual local
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time of the collection can be significant.</p>
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<p>For example, you may need to be sure which data was collected during the
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busiest period of the day so that it represents the heaviest workload experienced
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by the system under review. If some of the systems from which you collect
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performance data are located in different time zones, you should be aware
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of these considerations:</p>
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<ul><li>When you start Collection Services for a system group, you start Collection
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Services at the same time on all systems in the group. Any differences in
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system time and date settings due to some systems being located in different
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time zones are not taken into account.</li>
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<li>If you start Collection Services with the Management Central scheduler,
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the time at which the scheduler starts the task is based on the system time
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and date of your central system in Management Central.</li>
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<li>The management collection objects for each endpoint system reflect start
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and end times based on the QTIME and QUTCOFFSET (coordinated universal time
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offset) system values of that endpoint system and your central system. If
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the endpoint system is in a different time zone from your central system,
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and these system values are correctly set on both systems, the start and end
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times reported for collection objects are the actual times on the endpoint
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system. In other words, the start and end times reflect the value of QTIME
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on the endpoint system as it was at the actual point in time when those events
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occurred.</li>
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<li>The scheduling of a performance collection can cross a boundary from standard
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time to daylight saving time or from daylight saving time to standard time.
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If so, this time difference should be taken into account when scheduling the
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start time. Otherwise, the actual start and end times can be an hour later
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or earlier than expected. In addition, the reported start and end times for
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management collection objects are affected by this difference unless the QUTCOFFSET
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system value is adjusted each time the change to and from daylight saving
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time takes effect.</li>
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</ul>
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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="rzahx3b4.htm" title="When you use Collection Services to collect performance data, you control what data is collected and how often it is collected.">Customize data collections</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="rzahxcollectdatacs.htm" title="Use Collection Services to collect performance data for later analysis by the Performance Tools for iSeries licensed program or other performance report applications, iSeries Navigator monitors, and the graph history function. (If you prefer viewing real-time performance data, system monitors provide an easy-to-use graphical interface for monitoring system performance.)">Collection Services</a></div>
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<div><a href="../rzakz/rzakzqtime.htm">QTIME</a></div>
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<div><a href="../rzakz/rzakzqutcoffset.htm">QUTCOFFSET (coordinated universal time offset)</a></div>
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</div>
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</div>
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</body>
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