ReadyNAS 516 for mysql files

I have a customer who "needs more space" for some machines. I've been toying with the idea of doing something like a 516 with 4TB WD4000F9YZ or perhaps Samsung EVO SSD 1TB drives ( smaller drives seem to be compatible in the HCL ). Or Perhaps 4-5 of the SATAIII drives and an SSD or 2 for caching. ISCSI would work, SMB/NFS probably has too much latency.

I'm curious about IOPs throughput, latency for MySQL and general realworld feedback. The client states: "we won't be "running" the db there but there will be mysql db files there. This will be written to heavily and read very little. I'm aware that this would be in a production environment, but I'm focused more on getting some usable stats or info to make an informed decision.

This is about the most thorough article I've seen http://www.storagereview.com/netgear_readydata_516_review but it's got the stock drives in, and no info about "sql".

Any info would be most helpful. Thanks in advance.