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.
Replication 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.
You must decide on a software technology to use for logical replication. The following solutions are available for achieving logical replication in your cluster:
Data replication software from recognized cluster IBM Business Partners enables you to replicate objects across multiple nodes. See Cluster middleware IBM Business Partners and available clustering products for details.
IBM® 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.
