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Kioxia Demonstrates RAID Offload Scheme for NVMe Drives
by Ganesh T S on August 12, 2024 2:30 PM EST At FMS 2024, Kioxia had a proof-of-concept demonstration of their proposed a new RAID offload methodology for enterprise SSDs. The impetus for this is quite clear: as SSDs get faster in each generation, RAID arrays have a major problem of maintaining (and scaling up) performance.
In cases where there is no hardware acceleration, the data from the reads needs to travel all the way back to the CPU and main memory for further processing before the writes can be done. In Kioxia's PoC implementation, the DMA engine can access the entire host address space (including the peer SSD's BAR-mapped CMB), allowing it to receive and transfer data as required from neighboring SSDs on the bus. The proposed offload scheme can also handle scrubbing operations without taking up the host CPU cycles for the parity computation task.
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