Different MSCS cluster setups support different types of shared storage configurations. Some setups support more than one type. Select the recommended type of shared storage for best results.

Shared Storage Requirements

Storage Type

Clusters on One Physical Machine

(Cluster in a Box)

Clusters Across Physical Machines

(Cluster Across Boxes)

Clusters of Physical and Virtual Machines

(Standby Host Clustering)

Virtual disks

Yes

(recommended)

No

No

Pass-through RDM

(physical compatibility mode)

No

Yes

(recommended)

Yes

Non-pass-through RDM

(virtual compatibility mode)

Yes

Yes

No

Use of software iSCSI initiators within guest operating systems configured with MSCS, in any configuration supported by Microsoft, is transparent to ESXi hosts and there is no need for explicit support statements from VMware.

Note

Clusters across physical machines with non-pass-through RDM is supported only for clustering with Windows Server 2003. It is not supported for clustering with Windows Server 2008.