First thing is to verify that your server is supported. You'll need to go to the E-Lab Navigator and select the Simple Support Matrix, then select Storage and the VNX5100 - here's a quick link to that - click on the Unified/VNX5100.5300... link. When the matrix comes up look for your server.
This is where for VNX you can get information for a number of different activities for VNX, including attaching a host.
Go to mydocs.emc.com, select VNX Series, on next screen go to VNX Server tasks and select "Attach a Server" - follow the wizard.