From a san perspective there might not be a reason to split the luns into log, data, etc. However all the Best practice we follow in the physical world should be followed in the virtual world when it comes to database servers. Virtualising the os add some benefits and a small penalty, but it is in most cases worth it. There are storage queues per lun among other thing in both vmware and in the operation system from which you will benefit splitting up data, log, etc.

Also the number of spindles are important (even though you might have solid state as tier 0), because you will do both reads and writes and scaling and io requires spindles even with solid state (it just requires less spindles for solid state)

Since the san most likely will see io as random unless you have a small environment, you will benefit from Compellents tiering.