Seems a lot simpler to create a multi-way mirror.
Then symlink your /opt/BIND or whatever off to new place.
# zpool create opt-new mirror c3t40d0 c3t40d1 c3t40d2 c3t40d3
# zpool status
pool: opt-new
state: ONLINE
scrub: none requested
config:
NAME STATE READ WRITE CKSUM
opt-new ONLINE 0 0 0
mirror ONLINE 0 0 0
c3t40d0 ONLINE 0 0 0
c3t40d1 ONLINE 0 0 0
c3t40d2 ONLINE 0 0 0
c3t40d3 ONLINE 0 0 0
errors: No known data errors
There is no problem with having more than 2 disks in a mirror.
If you have an old system with a bunch of old disk I could see
good reason to be this paranoid.
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