You didn't say how fast it is?

That many drives, you should be able to saturate a good part of a 10Gb link. The difference for streaming read/write loads (like copying movies..) is night and day vs 1Gbit. That is assuming you've got enough CPU to run ZFS that fast. That is part of the reasons I stick to linux MD/xfs. Every time I try to use ZFS I run out of CPU or RAM. Also, given that I want low idle power means I'm not willing to throw enough hardware at it to make ZFS run well.