Recommendations for FCP storage pools

Hello.

Do you know of any Red Hat recommendations how to configure luns for RHEV 3.1 fcp storage domain? Luns will be served through SAN from enterprise class array. Which layout should I choose:

1. one big lun for all vms and data virtual disks
2. many equally sized luns making up fcp storage pool as a space for all virtual disks
3. dedicated luns for every vm.

I've spent quite a lot of time searching for relevant information unfortunately finding nothing useful.

Thanks in advance for help

Marek