Configuring RDM's on VM Cluster Nodes.
Add Hard Disks to the First Node for Clusters Across Physical Hosts
In an MSCS cluster, storage disks are shared between nodes. You set up a quorum disk and an optional shared
storage disk.
Prerequisites
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.
NOTE Use RDMs in physical compatibility mode. The procedure below uses physical compatibility mode.
Procedure
1 In the vSphere Client inventory, select the newly created virtual machine and select Edit Settings.
The Virtual Machine Properties dialog box appears.
2 Click Add, select Hard Disk, and click Next.
3 Select Raw Device Mappings and click Next.
4 Select an unformatted LUN and click Next
5 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.
6 Select Physical as the compatibility mode and click Next.
A SCSI controller is created when the virtual hard disk is created.
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 Finish to complete creating the disk.
The wizard creates a new SCSI controller and a new hard disk.
9 In the Virtual Machine Properties dialog box, select the new SCSI controller and click Change Type.
The Change SCSI Controller Type dialog box appears.
10 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 LSI Logic SAS
11 Click OK.
12 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.
Add Hard Disks to the Second Node for Clusters Across Physical Hosts
To allow shared access to clustered services and data, point the quorum disk of the second node to the same
location as the first node’s quorum disk. Point shared storage disks to the same location as the first node’s
shared storage disks.
Prerequisites
Before you begin, obtain the following information:
n Which virtual device node is for the first virtual machine's shared storage disks (for example, SCSI (1:0)).
n The location of the quorum disk specified for the first node.
Procedure
1 In the vSphere Client inventory, select the second virtual machine that you created and select Edit
Settings.
The Virtual Machine Properties dialog box appears.
2 Click Add, select Hard Disk, and click Next.
3 Select Use an existing virtual disk and click Next.
4 In Disk File Path, browse to the location of the quorum disk specified for the first node.
5 Select Physical as the compatibility mode and click Next.
A SCSI controller is created when the virtual hard disk is created.
Setup for Failover Clustering and Microsoft Cluster Service
6 Select the same virtual device node you chose for the first virtual machine’s shared storage disks (for
example, SCSI (1:0)), and click Next.
NOTE The location of the virtual device node for this virtual machine’s shared storage must match the
corresponding virtual device node for the first virtual machine.
7 Click Finish.
The wizard creates a new hard disk and a new SCSI controller.
8 In the Virtual Machine Properties dialog box, select the new SCSI controller and click Change Type.
The Change SCSI Controller Type dialog box appears.
9 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 LSI Logic SAS
10 Click OK.
11 Set SCSI Bus Sharing to Physical and click OK.
