On the other hand, a 3+1 offers less exposure to a drive failure in a RAID group than a 7+1. However I'm sure you could come up with a mathematical or statistical analysis to prove otherwise. So, in general, take a look at your application read and write characterize as well as I/O size and patterns and factor those into your decision to use a 3+1 or 7+1 or some other variation of a RAID parity group.
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