There won't be a performance hit beyond that of RAIDZ2 vs. RAIDZ.
But you'll wind up with a pool with fundamentally single-disk-failure
tolerance, so I'm not sure it's worth it (at least until there's a mechanism
for replacing the remaining raidz1 vdevs with raidz2).
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Does anyone know if there are any issues mixing one 5+2 raidz2 in the same pool
with 6 5+1 raidz1 vdevs? Would there be any performance hit?
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