I've been reading through the documentation on ZFS, and was hoping I could get 
some clarification and make sure I'm reading everything right.

I'm looking to build a NAS box, using sata drives in a double parity 
configuration (i.e. raidz2). This is mainly for warehousing large video files, 
so access speed and IOPS aren't terribly critical. I won't immediately need all 
15 drives online, so what I would like to do is be able to resize the raid 
array. 

Is there any way to resize with ZFS? Or would the only way to do this be to 
make one raidz2 with 7 drives, and then when I need to expand make another 
raidz2 in the same pool. Obviously having two virtual devices in the pool means 
losing 4 drives to parity instead of just two.

ie start out with 
zpool create tank raidz2  c1t1d0 c1t2d0 c1t3d0 c1t4d0 c2t1d0 c2t2d0 c2t3d0

and when i'm ready to expand use
zpool add tank raidz2 c2t4d0 c3t1d0 c3t2d0 c3t3d0 c3t4d0 c4t1d0  c4t2d0  c4t3d0

Any and all comments are appreciated.
 
 
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