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Software Defined Storage replaces most of the need for storage hardware technologies such as SAN and NAS appliances moving the functions of storage resiliency, redundancy, replications and numerous other features onto generic servers and individual disk drives or JBOD enclosures.

Storage systems traditionally were complex hardware systems dedicated completely to the storage function.   Software defined technologies move the complex software features and management to generic servers and commodity disk drive products, often consumer grade components.  The market conversion from dedicated storage hardware to software defined storage converges the number of dedicated technologies to standard server management, greatly reducing data center complexity while reducing costs.