Had an idea, could someone please tell me why it's wrong? (I feel like it has 
to be).

A RaidZ-2 pool with one missing disk offers the same failure resilience as a 
healthy RaidZ1 pool (no data loss when one disk fails).  I had initially wanted 
to do single parity raidz pool (5disk), but after a recent scare decided raidz2 
was the way to go.  With the help of a sparse file ('mkfile -n 2000G') offlined 
after pool creation, I was able to start using my pool before my 6th disk 
arrived.  Once it's here, I'll swap it in for the sparse file and let it 
resilver.

Can someone with a stronger understanding of ZFS tell me why a degraded RaidZ2 
(minus one disk) is less efficient than RaidZ1?  (Besides the fact that your 
pools are always reported as degraded.)  I guess the same would apply with 
RaidZ2 vs RaidZ3 - 1disk.

Thanks
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