An RDM has 2 compatibility modes:
Virtual = Fully virtualized mapped device and thus is able to take advantage of VMFS benefits such as advanced file locking and use of snapshots. Looks like a standard virtual disk to the VM.
Physical = Minimal SCSI virtualization of the mapped device. VMkernel passes most SCSI commands to the device. All physical attributes of the underlying device hardware are exposed to the VM.
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Virtual = Fully virtualized mapped device and thus is able to take advantage of VMFS benefits such as advanced file locking and use of snapshots. Looks like a standard virtual disk to the VM.
Physical = Minimal SCSI virtualization of the mapped device. VMkernel passes most SCSI commands to the device. All physical attributes of the underlying device hardware are exposed to the VM.
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