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Since the minimum for RAID 5 is 3 disks, does RAID 6 require 4 disks?
My math skills calculate you are using 5 disks in your RAID array since you have 80% usability with RAID 5 and 60% with RAID 6. I think that would be 75% in RAID 5 and 50% using 4 disks.
Hot spares sound better. Or maybe you need to be buying more dependable disks.