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In terms of rebuild time, for the same usage, 14D+2P will take lesser time. However, it can withstand 2 drive failure per 16 drives, whereas 6D+2P  can withstand 2 drive failures per 8 drives. One other consideration related to space usage is 14D+2P will result into higher usable spaces for same number ...

If you are using RAID-6 which can withstand 2 drive failures, you may still be good with no spare if luck permits. However, RAID groups wit failed drives will have lower performance.

We generally consider Deduplication ratios as 1.05 and Compression ratio as 2.86 for OLTP workloads. ------------------------------ Debdatta Chattopadhyay Hardware Test Engineer - Senior Hitachi Vantara ------------------------------