What do you mean by RDM?

1.	What do you mean by RDM?
Answer» The Raw Device Mapping (RDM) files are contained in VMFS and act as proxies for raw physical devices. This feature ENABLES VMWARE's virtual machines (VMs) to access logical unit numbers (LUNs) directly. This eliminates the need to use the virtual machine file system (VMFS) because the LUN can be formatted USING any file system like NTFS (New Technology File System). It is generally beneficial for cluster CONFIGURATIONS including VM-to-VM, physical-to-VM, or SAN (Storage Area Network) snapshots. But it has some limitations, including the inability to map disk partitions and possibly not working with direct-attached block devices. The figure above shows that an RDM disk exists as an address mapping file on a VMFS VOLUME. This mapping file acts as a symbolic link between a VM's access to an RDM disk to LUNs.

Answer»

The Raw Device Mapping (RDM) files are contained in VMFS and act as proxies for raw physical devices. This feature ENABLES VMWARE's virtual machines (VMs) to access logical unit numbers (LUNs) directly. This eliminates the need to use the virtual machine file system (VMFS) because the LUN can be formatted USING any file system like NTFS (New Technology File System). It is generally beneficial for cluster CONFIGURATIONS including VM-to-VM, physical-to-VM, or SAN (Storage Area Network) snapshots. But it has some limitations, including the inability to map disk partitions and possibly not working with direct-attached block devices.

The figure above shows that an RDM disk exists as an address mapping file on a VMFS VOLUME. This mapping file acts as a symbolic link between a VM's access to an RDM disk to LUNs.

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