An RDM has 2 compatibility modes:
Virtual - Fully virtualized mapped device. Able to take advantage of VMFS benefits such as advanced file locking & 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. Physical attributes of the underlying device hardware are exposed to the VM.
Both support vMotion.
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Virtual - Fully virtualized mapped device. Able to take advantage of VMFS benefits such as advanced file locking & 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. Physical attributes of the underlying device hardware are exposed to the VM.
Both support vMotion.
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