In an WSFC cluster with shared disk, storage disks are shared between nodes.


Before you add hard disks to the first node, complete the following tasks:

  • If you are using physical compatibility mode RDMs, ask your SAN administrator for the location of unformatted SAN LUNs. The hard disks you create in this task must point to SAN LUNs.
  • If you are using vVols storage for shared disk, please see Add Hard Disks to the First Node for Clusters Across Physical Hosts with VMware vSphere® Virtual VolumesTM.
  • If you are using Clustered VMDKs on VMFS datastores, please see Add Hard Disks to the First Node for Cluster Across Physical Hosts with Clustered VMDKs on VMFS datastores.
Note: Use RDMs in physical compatibility mode.


  1. In the vSphere Client, select the newly created virtual machine, right-click and select Edit Settings.
  2. Click the New device drop-down menu, to add a storage controller select VMware Paravirtual, and click Add.
    Note: LSI SAS is supported, but VMware Paravirtual is recommended.
  3. Click the New device drop-down menu, select RDM Disk, and click Add.
  4. Select an unformatted LUN.
  5. Select a datastore.
    This datastore must be on shared storage because you need a single shared RDM file for each shared disk.
  6. Select Physical as the compatibility mode.
  7. Select a new virtual device node (for example, select SCSI (1:0)), and click Next.
    Note: This must be a new SCSI controller. You cannot use SCSI 0.
  8. Click OK to complete creating the disk.
    The wizard creates a new hard disk.
  9. In the New Virtual Machine - Edit Settings dialog box, expand SCSI controller and select the SCSI Bus Sharing drop-down menu. Set SCSI Bus Sharing to Physical and click OK.


The virtual disks are added to the VM, a node of a WSFC, and prepared to be clustered across additional nodes.