Disaster Recovery for Credit Card Management Application


The largest processor of credit card transactions in the U.S. had to provide both ATM and POS services to a variety of financial and commercial firms. One of these services, the card management application (CMA), needed to implement a disaster recovery system to provide business continuity services in case of a disaster.

HPE Shadowbase Solution: Active/Backup Disaster Recovery

In Figure 1, the CMA is configured in an active/passive configuration with two HPE NonStop servers. The CMA updates the active NonStop server, which then utilizes Shadowbase to uni-directionally replicate the database changes to the backup NonStop server, in case the primary system fails and the backup server is needed for a failover.

For a full image description, please see the paragraph that starts with "In Figure 1."

Figure 1 — Shadowbase for Homogeneous Data Integration

  • The CMA application is active on the source node and is not running on the target node until (unless) a failover occurs.
  • In the event of a failure, all of the applications are loaded and started on the target node; then the users are switched to that node to continue processing.
  • The company initially deployed replication for just this one purpose – active/backup disaster recovery, but as the company has gained familiarity, it has expanded the use of replication to provide additional business continuity services for other applications.
  • The company has also added heterogeneous replication to and from various other platforms for applications such as Oracle-based fraud detection.

Contact us for more information on this Shadowbase solution.

The above was adapted from the book: Breaking the Availability Barrier, Volume III: Active/Active Systems in Practice by Paul J. Holenstein, Dr. Bruce Holenstein, and Dr. Bill Highleyman.