If you have 2 Fault Domains, usually for each of your 2 Fabric switches(I am assuming you do 2 Fabrics), then you should see half your front ports as paths to each LUN. Ie if you have 16 front-end ports, you should see 8 paths to each LUN.
Also be away that Compellent recommends Round Robin MPIO policy for your data stores. And do not forget to set the specific Qlogic or Emulex HBA settings on your esx hosts for the compellent. There are couple of port timeout settings to ensure failover works.