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Qumulo Core is a modern scale-out storage system designed from the ground up to address these challenges for the era of multipetabyte data scale on premises and in the cloud. Qumulo Core uses storage capacity much more efficiently than legacy scale-out NAS. At scale, Qumulo Core's rebuild times in the case of disk or node failure are faster and this allows administrators to greatly reduce the level of redundancy needed to achieve target MTTDL standards, thereby increasing storage efficiency. Enabled by Qumulo Core's flash-first hybrid design, cost and performance are optimized, simultaneously providing the speed benefits of SSD and the economic advantages of HDD. Further, Qumulo Core does not require any disk space to be left available for its internal use.