No good will come of this
Thus the reason why I detest the idea of intermixing "disk" traffic across the normal data LAN. I've already had to endure countless shouting matches over who gets what priority QoS wise, endless "marking" mashups and resisted the urge to throttle someone in a never ending meeting because of the insistence on 'converging' all of our services upon one poor wire. (or fiber).
Separate LANs especially within a data center were created for a reason. Piling them all onto the same switching network even with independent VLANs is just asking for trouble as far as I'm concerned.
Now, where's my stone tablet and chisel? I've got an email to get out.