Ah, you fell for the unified storage pitch, eh?
The golden rule is KISS - Keep It Simple Stupid.
Fibre channel has been around for 10 years, is stable and works well.
iSCSI is a wonderful thing- simple, straight forward and for the most part easy to implement.
Unified storage has 4 SPs, Celerra GUI, Navisphere GUI, spaghetti cabling and a lot of quals, firmware, caveats, etc.
Sure it works well, but really did you need to do NFS, CIFS, iSCSI, FC all at the same time off the same device, or would you have been better off just choosing the one that really fit your business and sticking with it?
I've seen this product work well, but typically it's because the customer is using a single protocol and not multiple ones.
So choose iSCSI or FC. Need some NAS on top of your block IO? Just use a simple Windows (CIFS) or Linux (SAMBA) server.
BTW, this has nothing to do with a CX4 - That's the new Clariion. What you bought was a Clariion with integrated NAS heads. At least you can always switch off the NAS part and just go straight to the CX and use the FC part of this to hook up your servers. Good luck.