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<h1 class="topictitle1">Plan for logical replication</h1>
<div><p>Multiple copies of the data are maintained with logical replication.
Data is replicated, or copied, from the primary node in the cluster to the
backup nodes designated in the recovery domain. When an outage occurs on the
primary node, the data remains available as a designated backup node takes
over as the primary point of access.</p>
<p><strong>Replication</strong> makes a copy of something in real time. It is the process
of copying objects from one node in a cluster to one or more other nodes in
the cluster. Replication makes and keeps the objects on your systems identical.
If you make a change to an object on one node in a cluster, this change is
replicated to other nodes in the cluster.</p>
<p>You must decide on a software technology to use for logical replication.
The following solutions are available for achieving logical replication in
your cluster:</p>
<ul><li><strong>IBM Business Partners products</strong> <p>Data replication software from
recognized cluster IBM Business Partners enables you to replicate objects
across multiple nodes. See <a href="rzaigplanmiddlewarebps.htm">Cluster middleware IBM Business Partners and available clustering products</a> for details.</p>
</li>
<li><strong>A custom-written replication application</strong> <p>IBM<sup>®</sup> journal management provides a means
by which you can record the activity of objects on your system. You can write
an application taking advantage of journal management to achieve logical replication.
See iSeries™ journal
management for details on how journal management works.</p>
</li>
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<li class="ulchildlink"><strong><a href="rzaigplandeterminesysreplication.htm">Determine which systems to use for logical replication</a></strong><br />
When you are determining which systems to use for logical replication, there are several key considerations.</li>
</ul>
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<div class="parentlink"><strong>Parent topic:</strong> <a href="rzaigplandataresilience.htm" title="Data resilience is achieved when data is always available to an user or application. You can achieve data resilience through the use of logical replication or switchable independent disk pools.">Plan for data resilience</a></div>
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<div class="relconcepts"><strong>Related concepts</strong><br />
<div><a href="../rzaki/rzakikickoff.htm">Journal management</a></div>
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