@Oksana said in Step-by-Step: Add RDM Disks to Your vSphere VM:

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Raw device mapping is still useful when you want direct LUN access from a VM, keep storage workflows on the array, or need physical mode behavior for specific workloads.
Our new article by Alex Bykovskyi for StarWind explains what RDM is, the difference between virtual and physical compatibility modes, how to present LUNs to ESXi hosts, and how to attach an RDM disk to a VM step by step. Read more here: https://starwind.com/s/142

Don't do this, you'll just create headaches for anyone following after you.