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VMDK vs RDM

RDM is recommended if you plan on using some of the special services provided by your SAN for this virtual machine; services such as:

replication,
snapshotting, or
something like a virtual and physical node in a MSCS clustered pair.

Otherwise stick with VMFS. There is virtually no performance difference and you retain the portability of your virtual machine.

RDM is usually used in environments where they for example need very big fileserver storage
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