All vSphere MSCS configurations require certain hardware and software components.

The following table lists hardware and software requirements that apply to all vSphere MSCS configurations.

Clustering Requirements



Virtual SCSI adapter

LSI Logic Parallel for Windows Server 2003

LSI Logic SAS for Windows Server 2008

Operating system

Windows Server 2003 SP2 or Windows Server 2008 R2

Virtual NIC

Use the default type for all guest operating systems.

I/O timeout

Set to 60 seconds or more. Modify HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Disk\TimeOutValue.

The system might reset this I/O timeout value if you re-create a cluster. You must reset the value in that case.

Disk format

Select Thick Provision to create disks in eagerzeroedthick format.

Disk and networking setup

Add networking before disks. Refer to the VMware knowledge base article at if you encounter any errors.

Number of nodes

Use two-node clustering.

NTP server

Synchronize domain controllers and cluster nodes with a common NTP server, and disable host-based time synchronization when using clustering in the guest.