ibm-information-center/dist/eclipse/plugins/i5OS.ic.rzaly_5.4.0.1/rzalymirrorben.htm

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<h1 class="topictitle1">Mirrored protection benefits</h1>
<div><p>With the best possible mirrored protection configuration, the system continues
to run after a single disk-related hardware failure. On some system units,
the failed hardware can sometimes be repaired or replaced without having to
turn off the system. If the failing component is one that cannot be repaired
while the system is running, such as a bus or an I/O processor, the system typically
continues to run after the failure. Maintenance can be deferred, the system
can be shut down normally, and a long recovery time can be avoided.</p>
<p>Even if your system is not a large one, mirrored protection can provide
valuable protection. A disk or disk-related hardware failure on an unprotected
system leaves your system unusable for several hours. The actual time depends
on the kind of failure, the amount of disk storage, your backup strategy,
the speed of your tape unit, and the type and amount of processing the system
performs. If you or your enterprise cannot tolerate this loss of availability,
you should consider mirrored protection for your system, regardless of your
system's size.</p>
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<div class="parentlink"><strong>Parent topic:</strong> <a href="rzalydpconcepts.htm">Disk protection</a></div>
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