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.

Table 1. 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



No No

Pass-through RDM

(physical compatibility mode)





Non-pass-through RDM

(virtual compatibility mode)

Yes No 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.