Where is my LUN Vmware ??????

So if you have multiple SAN's and you add a brand new SAN into your ESX environment , and you've done a LUN rescan via Virtual Center , and via esxcfg-rescan and you still don't see the storage.

Reboot your ESX host as your HBAs Bios will then be reset ( I'm thinking this is something to do with it getting its SCSI id sequencing re-ordered). And then your Vmware guys will be presented with there new LUNs