So I drew the 7x5GB drives and 1x20GB drive below. Each slab is here 512MB instead of the real 256MB, same thing anyway. I put 14 files in here, each 2 GB size, so it occupies 5 slabs = 2.5 GB disk ...
A mirror only lets you use one disk in a stack in usable space (50%, or less if for some reason you want a double redundant mirror, i.e. three disks). A RAID-Z ...
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