> Anyway you can add mirrored, [...], raidz, or raidz2 arrays to the pool,
> right?
correct.
> add a disk or two to increase your protected storage capacity.
if its a protected vdev, like a mirror or raidz, sure... one can
force add a single disk, but then the pool isn't protected until
you attach a mirror to that single disk. one can't (currently)
remove a vdev (shrink a pool) but one can increase each element
of a vdev increasing the size of the pool while maintaining the
number of elements (disk count)
Rob
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