Sizzling-Hot-Takeover (SZT) Availability for Island Bank


An island bank runs BASE24™ for point-of-sale (POS) and ATM services on HPE NonStop servers. The bank relied upon an untested active/passive business continuity solution for disaster recovery.


The bank needed to replace a legacy replication product, increase application availability, and provide a simple method for periodically testing the failover process. The bank needed to perform a BASE24 application upgrade and an HPE NonStop hardware refresh with no downtime.


Diagram of a ZDM from a uni-directional environment to a sizzling-hot-takeover (SZT, also known as active/almost-active) business continuity architecture from an old replication engine to Shadowbase. The top half of the diagram depicts POS Terminals, host institutions, and ATMs connected to an old BASE24 application and database pair, whose transaction changes are replicated by an old replication engine to the old backup consisting an old BASE24 application and database pair. This top half of the diagram represents the old environment. Shadowbase ZDM is connected from the old backup to the new production system, with Shadowbase SZT replicating from the new production to the new backup to keep the backup environment consistent. If a failover must be performed from the new production to the new backup, then a replication stream must be connected from the new backup system to the new production system.

Figure 1 — HPE Shadowbase Active/Almost-Active Business Continuity Architecture


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