IBM just published a new Redbook titled Understanding and Using Q Replication for High Availability Solutions on the IBM z/OS Platform.  Two of my fave Silicon Valley Lab replication developer/experts – Cecile Madsen and Jayanti Mahapatra – are co-authors.

Customer expectations in 2014 are that they can conduct business with a variety of financial, retail, and other enterprises 24x7x365.  Even with the availability characteristics of the System z platform in general and DB2 for z/OS in particular, planned and unplanned outages will occur. 

The Redbook focuses on IBM InfoSphere Data Replication (IIDR) Q Replication as the undergirding HA technology.  It details two-node and three-node active-active replication topologies.  I suspect much of the basis for the document is the massive deployment of Q Replication at a large commercial bank in Brazil.