We switched our staging databases to be on ZFS and saw inexplicable, very noticeable decreases in performance. Those trade-offs are fine for developer machines, but ultimately too much for our staging server where we needed to run UAT.
But, could of just been quirks of how we had things set up.
Not seen NetApp but from a quick Google it seems to be more intelligent database management.
Delphix is more using the power of ZFS and Copy On Write to give you instant database copies with minimal storage footprint. We used it to give every developer their own Database that they could do anything to and not worry about locks etc. Refreshing to a more recent copy was a very quick operation and required a developer running one command. Had a nice web interface and a REST interface for automation.
I'd recommend it but with the caveat that I've no idea how much it costs as it was a Dev thing a client was encouraging use of. Was really nice to work with though.
Any comments from people using it? I designed a CI system using Delphix at an old client and it was awesome!