Correct, don't use GbE switch uplink ports for 10GbE arrays.    It might  connect, but performance and stablity will very likely suffer.   Thus has been the experience of other customers who have tried to do it. 
Dear Friends, Need your help.... Please let me know if i can connect EQL 6110X (10G SFP+) storage to PC 6224 10G SFP+ ports for iSCSI connectivity to my servers in LAN which is 1G.[IMAGE]
Connecting EQL 6110X (10G SFP+) To PowerConnect 6224 10G Uplink-ports