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An RDM is a special mapping file in a VMFS volume that manages metadata for its mapped device. The mapping file is presented to the management software as an ordinary disk file, available for the usual file-system operations. To the virtual machine, the storage virtualization layer presents the mapped device as a virtual SCSI device.Key contents of the metadata in the mapping file include the location of the mapped device (name resolution) and the locking state of the mapped device.Figure 8-3. Mapping File Metadata
