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Gradual Failures

When replicating extremely large data stores between two quite distant locations, it may become infeasible to achieve real-time or even near-real-time replication delays. A write which hits one datacenter may take up to several hours to be copied to the other, along with all the other simultaneous writes carpooling along in the replication stream. This can make it quite difficult to achieve a tight RPO. If one site were to suddenly fall into the ocean, you would lose several hours’ worth of data! Fortunately, datacenters don’t fall into oceans very often. Sudden outages generally occur only when a utility power failure combines with a UPS or generator failure (with the odd explosion from time to time). However, there are plenty of other wa....


  

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