56 lines
3.2 KiB
HTML
56 lines
3.2 KiB
HTML
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<meta name="DC.Title" content="Input/output processor level protection" />
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<title>Input/output processor level protection</title>
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</head>
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<body id="hdrlopiop"><a name="hdrlopiop"><!-- --></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 processor level protection</h1>
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<div><div class="fignone"><p>Determine if you want IOP-level protection based on the following: </p>
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<ul><li>To keep your system available when an I/O processor fails.</li>
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<li>To keep your system available when the cable attached to the I/O processor
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fails.</li>
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<li>To concurrently repair certain types of disk unit failures or cable failures.
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For these failures, <a href="rzalycmaintdef.htm">concurrent
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maintenance</a> needs to reset the IOP. If any disk units that are attached
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to the IOP do not have IOP-level protection, then concurrent maintenance is
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not possible.</li>
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</ul>
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<p>To achieve IOP-level protection, all disk units that are attached to an
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I/O processor must have a mirrored unit attached to a different I/O processor.
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On many systems, IOP-level protection is not possible for the mirrored pair
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for unit 1.</p>
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<br /><img src="rzaix515.gif" alt="Figure showing the elements of IOP-level protection" /><br /><p>This figure shows the elements of IOP-level protection: one bus, attached
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to two IOPs, which are each connected to a separate IOA and a separate disk
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unit. The two storage units make a mirrored pair. With IOP-level protection,
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the system can continue to operate if one I/O processor fails. The system
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becomes unusable only if the bus fails.</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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