In an MSCS cluster, storage disks are shared between nodes. You set up a quorum disk and an optional shared storage disk.


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

  • For each virtual machine, configure the guest operating system’s private and public IP addresses.
  • 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 VVol storage for shared disk, please see Add Hard Disks to the First Node for Clusters Across Physical Hosts with VVol.
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, select RDM Disk, and click Add.
  3. Select an unformatted LUN.
  4. Select a datastore.
    This datastore must be on a SAN because you need a single shared RDM file for each shared LUN on the SAN.
  5. Select Physical as the compatibility mode.
  6. 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.
  7. Click OK to complete creating the disk.
    The wizard creates a new hard disk.
  8. In the New Virtual Machine - Edit Settings dialog box, expand SCSI controller and select the Change Type drop-down menu.
  9. Select the appropriate type of controller, depending on your operating system.
    Operating System Type of Controller
    Windows Server 2003 SP1 and SP2 LSI Logic Parallel
    Windows Server 2008 SP2 and above LSI Logic SAS and VMware Paravirtual
    For supported guest operating systems see Other Clustering Requirements and Recommendations.
  10. Click OK.
  11. 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 machine is connected to a public network and a private network with two virtual switches, and is connected to the quorum disk on FC SAN and the virtual machine virtual disk on local or remote storage.