I saw one more question by you -
>> "I do not see any need to create/configure LUN using SDU - I am not using FC or iSCSI from guest os as I would use if I were using physical machine - RD mapping is going to occur over FCoE from ESXi host and storage, transparently to guest os"
SnapDrive for Unix (SDU) / Snapdrive for Windows (SDW) is required for SnapManager for Oracle (SMO) to work. Existing storage/LUNs can be used. SDU/SDW will recognize and be able to use existing LUNs.
You can use the “snapdrive storage connect” command to connect the storage entity to the host.
The following article talks about Connecting to an RDM LUN on a guest OS. (This is for windows)
Hope this is useful.