Data Robotics Drobo S Review
CrystalDiskMark is a synthetic test that evaluates both sequential as well as random small and large file transfers. It does a nice job of providing a quick look at best and worst case scenarios with regard to hard drive performance--best case being large sequential transfers and worse case being small, random 4KB transfers. The charts below reflect only the best-case scenario, sequential reads and write.
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When using the USB 2.0 interface there is a much tighter grouping with the performance of all the devices--indicating that the USB 2.0 interface once again is the primary limiting factor. The SmartStor DS4600 still managed to squeak ahead with the write and read performance of both of its RAID 0 and RAID 10 modes, but the Drobo S is right behind it. The NexStarMX brings up the rear of the USB performance, and there is a noticeable speed loss when it goes from RAID 0 to RAID 1 mode.