When I did a similar upgrade a while back I did #2. Create a new pool raidz2
with 6 drives, copy the data to it, verify the data, delete the old pool, add
old drives + some new drives to another 6 disk raidz2 in the new pool.
Performance has been quite good, and the migration was very smooth.
The other nice thing about this arrangement for a home user is that I now only
need to upgrade 6 drives to get more space, rather than 12 per option #1. To be
clear, this is my current config.
NAME STATE READ WRITE CKSUM
raid ONLINE 0 0 0
raidz2-0 ONLINE 0 0 0
c9t4d0 ONLINE 0 0 0
c9t5d0 ONLINE 0 0 0
c9t6d0 ONLINE 0 0 0
c9t7d0 ONLINE 0 0 0
c10t5d0 ONLINE 0 0 0
c10t4d0 ONLINE 0 0 0
raidz2-1 ONLINE 0 0 0
c9t0d0 ONLINE 0 0 0
c9t1d0 ONLINE 0 0 0
c10t0d0 ONLINE 0 0 0
c10t1d0 ONLINE 0 0 0
c10t2d0 ONLINE 0 0 0
c10t3d0 ONLINE 0 0 0
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