49 lines
2.7 KiB
HTML
49 lines
2.7 KiB
HTML
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<title>Ring-level protection</title>
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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">Ring-level protection</h1>
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<div><div class="fignone"><p>Determine if you want Ring-level protection based on the following: </p>
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<ul><li>HSL failures are rare compared with other disk-related hardware failures.</li>
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<li>If an HSL fails, disk I/O operations might continue, but other hardware
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is lost (such as work stations, printers and communication lines) making the
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system unusable.</li>
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</ul>
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<br /><img src="rzaix517.gif" alt="Figure showing the elements of ring-level protection" /><br /><p>To achieve ring-level protection, all disk units that are present in the
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expansion unit in the first HSL must also have a mirrored units present in
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another expansion unit in the second HSL. The figure shows the elements of
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ring-level protection: two HSL rings, connected to two expansion units that
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each contain two buses that are attached to separate IOPs, IOAs, and disk
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units, respectively.</p>
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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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