Using the PVSCSI driver with low throughput workloads may introduce a small increase in latency. Virtual Desktops don't tend to have a really high I/O. (You do not have to rescan the SCSI bus yourself to find a new device on Windows you do not have to do rescan ever with ESX4.x, neither with LSI nor LSI-SAS) It is worth noting, in Linux guests SCSI disk hotplug works better with SAS than with original parallel LSI. The default controller for a Windows 7 virtual machine is the LSI Logic SAS. There is no performance between this controller over the regular LSI Logic Parallel controller, so I therefore see no reason to change it. 'The LSI Logic adapter has improved performance and works better with generic SCSI devices.' *VMware's recommendation is to use the LSI Logic adapter. With a few additional configuration changes to the Queue Depth, BusLogic can perform on a par with LSI in VM's that have less than 4GB of RAM – BusLogic is a 32 bit PCI device and is limited to DMA ( Direct Memory Access) in the first 4GB of the guest memory, so if the guest uses more than 4GB memory the OS will need to use bounce buffering (doing IO to lower memory and copy up/down with the CPU), which adds overhead 'Out of the box' LSI out performs BusLogic.XP doesn't contain the LSI Logic driver so you will have to load it into the OS manually.BusLogic is not actively being improved by VMware or Guest OS's (so bugs come along as things change in the OS and noone fixes them).BusLogic is not supported in a lot of the newer Operating Systems.If you have decided to use SCSI, you now have to decide on whether to use the BusLogic or LSI Logic SCSI controller. If you ever need to increase the size of an IDE Disk you would have to use VMware Converter to enlarge it.

The SCSI adapter is better optimized for parallel performance.The IDE adapter completes one command at a time – SCSI can queue commands.Most people's main argument around reasons to not use IDE are

Of course you can make your own decisions. Most of the points made are desktop focused, however most will apply outside of a View environment. The PVSCSI controller will be the controller of the future so you may also want to keep this in mind. I've seen and had many discussions around this topic when discussing VMware View desktop design, so I though I'd gather as much information as I could to help you decide.įrom the information below, I would personally recommend using the following:

Lsi logic scsi driver