Nimble took a fundamentally different approach to other vendors.
Nimbles CASL architecture leverages multi-core processors and a new data layout that converts random writes into sequential writes. This allows dense, low-cost 7200 RPM disks to consistently perform at SSD speeds, eliminating the need to depend on disk spindles for performance.
CASL’s SSD read cache is much more efficient and responsive than tiered flash.
Nimble typically requires only one-third to one-fifth of the hardware of to that of the competitors to deliver the same or better performance and capacity.
Add on highly efficient snapshots and replication, plus the ability to independently (and non-disruptively) scale performance and capacity, and you start to see why Nimble have gained such momentum in the market.