Mechanism behind RDM Snapshots

[Kindhitler]

Wondering how Virtual compatibility Dependent RDM disks snapshot works. 

Once the snapshot is taken, where the upcoming data will be written. To the RDM disk or to some datastore (may be where mapping file exists)?

And how reverting snapshot will work?

**Just my assumption - That, even after snapshot is being taken, data will still write to RDM disk (RAW LUN) and somewhere it stores the detail of snapshot taken point. And once snapshot is reverted, the data written after the snapshot will be deleted from the RDM disk itself(with the reference point gathered during snapshot taken.

My assumption may be meaningless. Please correct me. 

[Shen88]

@Kindhitler,

As per my understanding in the virtual compatibility mode, RDM acts like a virtual disk file by virtualizing the physical properties of the underlying storage. Thus, it appears how a vDisk file would appear on a VMFS volume. Barring read and write commands, all commands are virtualized and sent directly to the raw LUN.