vCOps Commands per Second

What is the difference between these two metrics on a virtual machine:

virtual disk - > commands per second

storage -> commands per second

Does

"storage-commands per second"

include RDMs and

"virtual disk-Commands per second"

does not?

Are all virtual disks on a given VM summed up in "virtual disk->commands per second"?

If a VM has 2 virtual disks, I want to look at total IOPs for the whole VM - I'm not concerned about the differences between the individual virtual disks on that VM.

Thanks!