RAID5 + spare vs. RAID6 (simple)

Which is better, RAID5 + spare or RAID6, for LARGE drives >= 3tb in a NAS environment.
I can see rebuilding a drive for more than 1 day to be a problem. More so during light use.

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  1. Best answer
    Either case you are losing 2x in parity or parity + spare. I would go with the Raid 6 if using 3Tb drives based on the possibility of a drive failing in a Raid 5 set while rebuilding which would leave you with a broken array. Depending on the amount of day on the array it could very easily take over a day to rebuilt if you lose a drive. I'm not sure what type of hardware you will be working with, but generally you can give the rebuild process a prioritization so that it either rebuilds quicker, or the data set is more responsive during the rebuild but it takes longer to complete the repair.
  2. Best answer selected by enewmen.
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