55 lines
3.1 KiB
HTML
55 lines
3.1 KiB
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="Input/output adapter level protection" />
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<title>Input/output adapter level protection</title>
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<body id="hdrlopctl"><a name="hdrlopctl"><!-- --></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">Input/output adapter level protection</h1>
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<div><div class="fignone"><p>Determine whether you want input/output adapter (IOA) level protection
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based on the following: </p>
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<ul><li>To keep your system available when an IOA fails.</li>
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<li>To concurrently repair a failed disk unit or IOA. To use problem recovery
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procedures in preparation for isolating a failing item or to verify a repair
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action, the IOA must be dedicated to the repair action. If any disk units
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that are attached to the IOA do not have IOA-level protection, then this part
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of <a href="rzalycmaintdef.htm">concurrent maintenance</a> is
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not possible.</li>
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</ul>
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<p>To achieve IOA-level protection, all disk units must have a mirrored unit
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attached to a different IOA. This figure shows IOA-level protection. The two
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storage units make a mirrored pair. With IOA-level protection, the system
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can continue to operate if one IOA fails. If the I/O processor fails, the
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system cannot access data on either of the disk units, and the system is unusable.</p>
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<br /><img src="rzaix514.gif" alt="Figure showing the elements of IOA-level protection" /><br /><p>This figure shows the elements of IOA-level protection: one bus, connected
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to one I/O processor, connected to two IOAs, which are each attached to a
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separate disk unit. </p>
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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="rzalymirror3.htm">Determine the level of protection that you want</a></div>
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</div>
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