Paravirtual SCSI (PVSCSI) adapters are high performance storage adapters that can result in greater throughput and lower CPU utilization. PVSCSI adapters are best suited for high performance storage environments.

PVSCSI adapters are available for virtual machines running hardware version 7 and later. They are supported on the following guest operating systems:

Windows Server 2008 R2 (64bit)

Windows Server 2008 (32bit and 64bit)

Windows Server 2003 (32bit and 64bit)

Windows XP (32bit and 64bit)

Windows Vista (32bit and 64bit)

Windows 7 (32bit and 64bit)

Red Hat Linux 5 (32bit and 64bit)

PVSCSI adapters have the following limitations:

Disks on PVSCSI adapters might not experience performance gains if they have snapshots or if memory on the ESX host is over committed.

If you upgrade from RHEL 5 to an unsupported kernel, you might not be able to access data on the disks attached to a PVSCSI adapter. To regain access to such disks:

a

Upgrade the guest kernel but do not restart the guest.

b

Run the VMware Tools configuration with the kernel-version parameter and pass the kernel version within the guest:

vmware-config-tools.pk --kernel-version kernel_version

Run name -r to determine the version of the running kernel.

c

Restart the guest.

MSCS clusters are not supported.

PVSCSI adapters do not support boot disks (the disk that contains the system software) on Red Hat Linux 5 virtual machines. Attach the boot disk to the virtual machine by using any of the other supported adapter types.