Should I Use Seperate RDM Disks / LUNs for Server 2012 Clusters?

I am new to the VMware scene so please bear with me.  I am looking at setting up some Windows 2012 Clusters for my File Server, SQL Server and Exchange Server.  From my understanding, in order to setup Windows Server 2012 clusters the data must be stored on a RDM Disk.  Should I (or maybe I need to) setup multiple LUNs / RDM Disks for each of the clusters that I wish to create?  

For example, do I need to setup a LUN / RDM for my SQL cluster and then another seperate LUN / RDM disk for my File Server cluster or can I just create one large LUN / RDM disk for all of the clusters?
csimmons1324IT ManagerAsked:
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Seth SimmonsSr. Systems AdministratorCommented:
you need to create separate disks for each
a separate small disk for the quorum, separate disk for sql data
another quorum for your file server cluster, and another separate disk for file data

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