67 lines
3.7 KiB
HTML
67 lines
3.7 KiB
HTML
<?xml version="1.0" encoding="UTF-8"?>
|
|
<!DOCTYPE html
|
|
PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
|
|
<html lang="en-us" xml:lang="en-us">
|
|
<head>
|
|
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
|
|
<meta name="security" content="public" />
|
|
<meta name="Robots" content="index,follow" />
|
|
<meta http-equiv="PICS-Label" content='(PICS-1.1 "http://www.icra.org/ratingsv02.html" l gen true r (cz 1 lz 1 nz 1 oz 1 vz 1) "http://www.rsac.org/ratingsv01.html" l gen true r (n 0 s 0 v 0 l 0) "http://www.classify.org/safesurf/" l gen true r (SS~~000 1))' />
|
|
<meta name="DC.Type" content="topic" />
|
|
<meta name="DC.Title" content="Costs and limitations of geographic mirroring" />
|
|
<meta name="DC.Relation" scheme="URI" content="rzalygeographicmirror.htm" />
|
|
<meta name="copyright" content="(C) Copyright IBM Corporation 2002, 2006" />
|
|
<meta name="DC.Rights.Owner" content="(C) Copyright IBM Corporation 2002, 2006" />
|
|
<meta name="DC.Format" content="XHTML" />
|
|
<meta name="DC.Identifier" content="rzalygeocosts" />
|
|
<meta name="DC.Language" content="en-us" />
|
|
<!-- All rights reserved. Licensed Materials Property of IBM -->
|
|
<!-- US Government Users Restricted Rights -->
|
|
<!-- Use, duplication or disclosure restricted by -->
|
|
<!-- GSA ADP Schedule Contract with IBM Corp. -->
|
|
<link rel="stylesheet" type="text/css" href="./ibmdita.css" />
|
|
<link rel="stylesheet" type="text/css" href="./ic.css" />
|
|
<title>Costs and limitations of geographic mirroring</title>
|
|
</head>
|
|
<body id="rzalygeocosts"><a name="rzalygeocosts"><!-- --></a>
|
|
<!-- Java sync-link --><script language="Javascript" src="../rzahg/synch.js" type="text/javascript"></script>
|
|
<h1 class="topictitle1">Costs and limitations of geographic mirroring</h1>
|
|
<div><div class="section"><h4 class="sectiontitle">Costs</h4><p>To configure geographic mirroring between
|
|
two sites, the following items are required:</p>
|
|
<div class="p"><ul><li>At least one iSeries™ server
|
|
at each site. </li>
|
|
<li>Sufficient CPU support for the additional CPU capacity required
|
|
for geographic mirroring. A fraction of a processor for a partition supporting
|
|
geographic mirroring is not adequate.</li>
|
|
<li>Sufficient disk units at each site for the production and
|
|
the mirror copy of the geographically mirrored independent disk pools. To
|
|
avoid disk unit contention, use separate input/output adapters for the production
|
|
copy on its node and for the mirror copy on its node.</li>
|
|
<li>One TCP/IP connection from each node should
|
|
connect the two sites. A second TCP/IP connection is strongly recommended
|
|
to provide redundancy and better performance. You may configure up to four
|
|
TCP/IP connections. See <a href="rzalycommunications.htm">Communications requirements</a> for
|
|
more information.</li>
|
|
</ul>
|
|
</div>
|
|
</div>
|
|
<div class="section"><h4 class="sectiontitle">Limitations</h4><div class="p">Limitations
|
|
of geographic mirroring include these constraints:<ul><li>When geographic mirroring is being performed, you cannot access the mirror
|
|
copy; this ensures that the data integrity of the mirror copy is maintained.</li>
|
|
<li>If you detach the mirror copy to perform a save operation, to perform
|
|
data mining, or to create reports, you must reattach the mirror copy to resume
|
|
geographic mirroring. The mirror copy must be synchronized with the production
|
|
copy after it is reattached. Synchronization can be a lengthy process.</li>
|
|
<li>Synchronization can be a lengthy process, especially if geographic mirroring
|
|
was suspended without tracking.</li>
|
|
</ul>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
<div>
|
|
<div class="familylinks">
|
|
<div class="parentlink"><strong>Parent topic:</strong> <a href="rzalygeographicmirror.htm">Geographic mirroring</a></div>
|
|
</div>
|
|
</div>
|
|
</body>
|
|
</html> |