VMware Paravirtual SCSI controllers are high performance storage controllers that can result in greater throughput and lower CPU use. These controllers are best suited for high performance storage environments.

VMware Paravirtual SCSI controllers are available for virtual machines with ESXi 4.x and later compatibility. Disks on such controllers might not experience optimal performance gains if they have snapshots or if memory on the ESXi host is over committed. This behavior does not mitigate the overall performance gain of using VMware Paravirtual SCSI controllers as compared to other SCSI controller options.

If you have virtual machines with VMware Paravirtual SCSI controllers, those virtual machines cannot be part of an MSCS cluster.

For more information about configuring MSCS clusters, see the Setup for Failover Clustering and Microsoft Cluster Service documentation.

For platform support for VMware Paravirtual SCSI controllers, see the VMware Compatibility Guide at http://www.vmware.com/resources/compatibility.