Continuous Data Protection (CDP) is a recent storage technology which enables reverting the state of the storage to previous points in time. This paper proposes four alternative architectures for supporting CDP in a storage controller, and compares them analytically with respect to both write performance and space usage overheads. The paper describes exactly how factors such as the degree of protection granularity (continuous or at fixed intervals) and the temporal distance distribution of the given workload affect these overheads. The model allows predicting the CDP overheads for arbitrary workloads and concluding the best architecture for a given scenario.
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