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.


Use RDMs in physical compatibility mode. The procedure below uses physical compatibility mode.


In the vSphere Client inventory, select the newly created virtual machine and select Edit Settings.

The Virtual Machine Properties dialog box appears.


Click Add, select Hard Disk, and click Next.


Select Raw Device Mappings and click Next.


Select an unformatted LUN and click Next.


Select a datastore and click Next.

This datastore must be on a SAN because you need a single shared RDM file for each shared LUN on the SAN.


Select Physical as the compatibility mode and click Next.

A SCSI controller is created when the virtual hard disk is created.


Select a new virtual device node (for example, select SCSI (1:0)), and click Next.


This must be a new SCSI controller. You cannot use SCSI 0.


Click Finish to complete creating the disk.

The wizard creates a new SCSI controller and a new hard disk.


In the Virtual Machine Properties dialog box, select the new SCSI controller and click Change Type.

The Change SCSI Controller Type dialog box appears.


Select the appropriate type of controller, depending on your operating system.

Operating System

Type of Controller

Windows Server 2003

LSI Logic Parallel

Windows Server 2008



Click OK.


On the Virtual Machine Properties dialog box, 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.