74 lines
4.3 KiB
HTML
74 lines
4.3 KiB
HTML
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<meta name="DC.Type" content="concept" />
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<meta name="DC.Title" content="Choose availability options" />
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<meta name="abstract" content="Availability options are a complement to a good save strategy, not a replacement." />
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<title>Choose availability options</title>
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</head>
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<body id="rzaj1availopt"><a name="rzaj1availopt"><!-- --></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">Choose availability options</h1>
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<div><p>Availability options are a complement to a good save strategy,
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not a replacement.</p>
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<p>Availability options can significantly reduce the time it takes you to
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recover after a failure. In some cases, availability options can prevent
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you from having to perform a recovery.</p>
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<div class="p">To justify the cost of using availability options, you need to understand
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the following items: <ul><li>The value your system provides.</li>
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<li>The cost of a scheduled or unscheduled outage.</li>
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<li>What your availability requirements are.</li>
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</ul>
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</div>
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<div class="p">The following list shows the availability options that you can use to complement
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your save strategy: <ul><li>Journal management lets you recover the changes to objects that have occurred
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since your last complete save.</li>
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<li>Access path protection lets you re-create the order in which records in
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a database file are processed.</li>
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<li>Disk pools limit the amount of data you need to recover to the data in
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the disk pool with the failed unit.</li>
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<li>Device parity protection enables you to reconstruct data that is lost;
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the system can continue to run while the data is being reconstructed.</li>
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<li>Mirrored protection helps you keep your data available because you have
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two copies of the data on two separate disk units.</li>
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<li>Clustering lets you maintain some or all data on two systems; the secondary
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system can take over critical application programs if the primary system fails.</li>
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</ul>
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</div>
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<p>The Availability roadmap for your iSeries™ topic contains information that
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you can use to implement an availability solution on your iSeries server.</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="rzaj1overview.htm" title="This topic describes what to do in the event that you need to use backup copies if you lose information on your system.">Plan a backup and recovery strategy</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="../rzalw/rzalwoverview.htm">Availability roadmap for your iSeries server</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="../rzaiu/rzaiurzaiu116.htm">Special values for the SAVLIB command</a></div>
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</div>
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</div>
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</body>
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