I've not heard of anyone use that particular setup.  I've only seen it work with optical cables end-to-end.  However, long term the uplink ports are NOT going to be sufficient for 10GbE iSCSI arrays.   They weren't designed for that.  Customers attempting to do so, typically have connection problems under actual load.   A switch like an 8024F would be better.  I've been asking around and no one has heard of anyone trying what you are doing.   Sorry.  -don 
We purchased an EqualLogic PS6510E a few months ago as well as a Cisco 3750E switch.  Because this switch does not natively support a 10Gig connection, we purchased two of the Cisco OneX Converter Modules which converts the X2 ports on the switch to 10Gig SFP+ ports.  We have connected the EqualLogic Eth0 ports to these two OneX modules in the switch using two Cisco Twinax cables which are supposed to work and be supported by the OneX modules. However, I have been unable to establish a link between the PS6510E and the network switch.  I have spent hours speaking to Dell support and they have been extremely helpful but nothing has worked.  I also upgraded the IOS software to the latest version on our 3750E still with no luck.  Does anybody have any suggestions?  Is it because we are trying to connect a storage array to the uplink ports on the switch?  Nobody has been able to provide any solid answers so far.  Thanks for any help you might be able to provide.
PS6510E unable to connect to Cisco 3750E