6.0

If you create an LSI Logic virtual machine and add a virtual disk that uses BusLogic adapters, the virtual
machine boots from the BusLogic adapters disk. LSI Logic SAS is available only for virtual machines with
hardware version 7 or later. Disks with snapshots might not experience performance gains when used on
LSI Logic SAS, VMware Paravirtual, and LSI Logic Parallel adapters.
CAUTION Changing the SCSI controller type might result in a virtual machine boot failure.
Procedure
1 In the vSphere Client inventory, right-click the virtual machine and select Edit Settings.
2 Click the Hardware tab and select a SCSI controller.
3 In the SCSI Controller Type pane, click Change.
4 Select a SCSI controller type and click OK.
5 Click OK to save your changes.
About VMware Paravirtual SCSI Controllers
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 platform support for VMware Paravirtual SCSI controllers, see the VMware Compatibility Guide at
http://www.vmware.com/resources/compatibility.
Add a Paravirtual SCSI Controller
You can add a VMware Paravirtual SCSI high performance storage controller to provide greater throughput
and lower CPU utilization.
VMware Paravirtual SCSI controllers are best suited for environments, especially SAN environments,
running I/O-intensive applications.
Prerequisites
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Verify that the virtual machine has a guest operating system with VMware Tools installed.
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Verify that the virtual machine has hardware version 7 or later.
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Ensure that you are familiar with VMware Paravirtual SCSI limitations. See “About VMware
Paravirtual SCSI Controllers,” on page 166.
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To access boot disk devices attached to a VMware Paravirtual SCSI controller, verify that the virtual
machine has a Windows 2003 or Windows 2008 guest operating system.
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In some operating systems, before you change the controller type you need to create a virtual machine
with an LSI Logic controller, install VMware Tools, then change to paravirtual mode.
vSphere Administration with the vSphere Client
166 VMware, Inc.