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VMware ESXi Cookbook by Aravind Sivaraman, Mohammed Raffic Kajamoideen

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Configuring Raw Device Mapping

Raw Device Mapping (RDM) is a method to provide direct access of iSCSI or Fibre Channel storage LUN to a virtual machine. RDM is basically a mapping file placed in a VMFS volume, which acts as a proxy for a raw physical storage device. A virtual machine can access the storage device directly using RDM, and RDM contains metadata, which controls the disk access to the physical device. The following are some of the use case scenarios for using Raw Device Mapping:

  • For Microsoft cluster configuration in a virtual machine (virtual-to-virtual or physical-to-virtual configuration)
  • For configuring a virtual machine to use N_Port ID Virtualization (NPIV)
  • For running the SAN management software (storage resource management software, ...

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