ESX and Lun design

Hi,

I am a little confused about the LUN design when using ESX server's which host Windows clustered VM's.

This is my take on how I think it should be setup and I would very much appreciate any comments.

I am going to connect two clustered ESX servers to my SAN. I will create a LUN and give both ESX servers access to this Lun which will be formatted a VMFS for the storage of VM images. The part that I'm unsure about is some of my VM's are going to running Microsoft clustering i.e. SQL servers.

My understanding is that the shared storage for the SQL servers will need to be RDM. Do I have to give the ESX servers access to the LUN that is going to be used for SQL database storeage.

Setup

ESX1 will have access to LUN 100 500gb vmfs
ESX2 will have access to LUN 100 500gb vmfs

VM_SQL1 will be installed on LUN 100 but will have it's D drive (RDM) located on LUN 110
VM_SQL2 will be installed on LUN 100 and will have access to LUN 110.

The ESX servers will not have access to LUN 110.

Is this correct?

Any assistance is much appreciated.