A three-way mirror and three disks in a double parity array are going to get you
the same usable space. They are going to get you the same level of redundancy.
The only difference is that the RAIDZ2 is going to consume a lot more CPU cycles
calculating parity for no good cause.
In this case, a three-way mirror is the way to go.
Sorry, I meant to say that I will have 3 disks if I am doing raidz. If I
am doing mirror, I will
just have 2.
Thanks for clarification on something else though, about double parity
with 3 disks resulting in
only 1 usable disk blocks.
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