A synchronous dual data center solution (SDDC) has one cluster stretched across two separate sites (data centers). Each data center has a database instance with the exact same number of nodes. Since the instances share the same data volume, only one of them can be running. The production database is normally running on the primary site, while data blocks in the master segments there are mirrored to redundancy segments on the secondary site.

This solution provides business continuity with minimum downtime in case of both node failure or a complete outage on the primary site. Since communication only happens on the storage layer during normal operation, there is no risk of performance or syncing issues due to network latency.