82 lines
5.0 KiB
HTML
82 lines
5.0 KiB
HTML
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<title>Remote disk unit mirroring support</title>
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<body id="hdrremote"><a name="hdrremote"><!-- --></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">Remote disk unit mirroring support</h1>
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<div><p>Standard disk unit mirroring support requires that both disk units of the
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load source mirrored pair (unit 1) are attached to load source IOP. This allows
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the system to IPL from either load source in the mirrored pair and allows
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the system to dump main storage to either load source if the system ends abnormally.
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However, since both load sources must be attached to the same
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IOP, the best mirroring protection possible for the load source mirrored pair
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is IOA-level protection. To provide a higher level of protection for your
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system, you can use remote load source mirroring and remote disk unit mirroring.</p>
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<p>Remote disk unit mirroring support, when combined with remote load source
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mirroring, mirrors the disk unit on local optical buses with the disk unit
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on optical buses that terminates at a remote location. In this configuration,
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the entire system, including the load source, can be protected from a site
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disaster. If the remote site is lost, the system can continue to run on the
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disk unit at the local site. If the local disk unit and system unit are lost,
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a new system unit can be attached to the set of disk units at the remote site,
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and system processing can be resumed.</p>
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<p>Remote disk unit mirroring, like standard disk unit mirroring, supports
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mixing device-parity-protected disk units in the same disk pool with mirrored
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disk units; the device parity disk unit can be located at either the local
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or the remote site. However, if a site disaster occurs at the site containing
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the device parity disk unit, all data in the disk pools containing the device
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parity disk unit is lost.</p>
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<p>Remote mirroring support makes it possible to divide the disk units on
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your system into a group of local disk units and a group of remote disk units.
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The remote disk units are attached to one set of optical buses and the local
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disk units to another set of buses. The local and remote disk units can by
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physically separated from one another at different sites by extending the
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appropriate optical buses to the remote site. The distance between the sites
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is restricted by the distance that an optical bus may be extended.</p>
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<p>If you decide that remote disk unit mirroring is needed for your system,
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you need to <a href="rzalyremoteplan.htm">Prepare your system for remote mirroring</a> and then <a href="rzalyremotestart.htm">Start site-to-site mirroring</a>.</p>
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</div>
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<div>
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<ul class="ullinks">
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<li class="ulchildlink"><strong><a href="rzalyremoteload.htm">Remote load source mirroring</a></strong><br />
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</li>
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<li class="ulchildlink"><strong><a href="rzalyremoteadv.htm">Advantages of remote disk unit mirroring</a></strong><br />
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</li>
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<li class="ulchildlink"><strong><a href="rzalyremotedis.htm">Disadvantages of remote loadsource disk unit mirroring for primary partitions on an IBM iSeries server</a></strong><br />
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</li>
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<li class="ulchildlink"><strong><a href="rzalycompmir.htm">Comparison of standard mirroring and remote mirroring</a></strong><br />
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</li>
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</ul>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="rzalydpconcepts.htm">Disk protection</a></div>
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</div>
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</div>
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</body>
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