Use an RDM with virtual machine clusters that require access to the same raw LUN for failover scenarios. The setup is similar to that of a virtual machine cluster that accesses the same virtual disk file, but an RDM replaces the virtual disk file.
![The graphic shows two clustered virtual machines with shared access to the same RDM file on a VMFS datastore.](images/GUID-1EA23ED6-1BF0-4E12-BDA5-2CA6BCBCC3AE-high.png)
Use an RDM with virtual machine clusters that require access to the same raw LUN for failover scenarios. The setup is similar to that of a virtual machine cluster that accesses the same virtual disk file, but an RDM replaces the virtual disk file.