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Huawei SAN Storage Host Connectivity Guide for VMware ESXi

HUAWEI SAN Storage Host Connectivity Guide for VMware ESXi Servers

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Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document. Note: Even the most advanced machine translation cannot match the quality of professional translators. Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).
VMware RDM

VMware RDM

VMware RDM enables VMs to directly access storage. As shown in Figure below, an RDM disk exists as an address mapping file on the VMFS volume. This mapping file can be considered as a symbolic link that maps a VM's access to an RDM disk to LUNs.

Figure 2-5 RDM mechanism

RDM provides two compatible modes, both of which supports vMotion, Distributed Resource Scheduler (DRS), and High Availability (HA)

  • Virtual compatibility: fully simulates VMDK files and supports snapshots.
  • Physical compatibility: directly accesses SCSI devices and does not support snapshots.

    RDMs are applicable in the following scenarios:

  • Physical to Virtual (P2V): migrates services from a physical machine to a virtual machine.
  • Virtual to Physical (V2P): migrates services from a virtual machine to a physical machine.
  • Clustering physical machines and virtual machines.
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Updated: 2020-01-17

Document ID: EDOC1000144883

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