If you are installing Windows from media or an ISO image:
- Edit the VM settings, replace any networks adapters with ones that are of the type "VMXNET 3."
- Change the SCSI controller type to "Paravirtual"
- On the floppy drive choose "use existing floppy image in datastore:", click browse, then find the relevant image in vmimages\floppies for your version of windows. Dont forget to "select connect at startup"
- Hit F6 during the initial installation to add the paravirtual SCSI drivers from the floppy image.
- The OS wont recognise the network card until the VMware tools are installed.
- Edit the VM settings, replace any networks adapters with ones that are of the type "VMXNET 3"
- Using the Vshpere client Edit the settings of your Windows VM, Click the "Add..." button, choose "Hard Disk", Choose "Create a new Virtual disk" and set a small size like 8 MB.
- If your VM already has a SCSI controller you will need to add an additional one. To get another controller you will need to choose a virtual device node which is from the second SCSI controller. I usually just select SCSI(1:0).
- Check device manager to ensure the the PVSCSI controller has been detected.
- Shutdown the VM, remove the hard drive you have just added and change the remaining SCSI adapter to type "Paravirtual"
- Start the machine, if all is well (you will see a blue screen if it isn't) you will have successfully changed windows to use a more efficient way to talk to it's boot drive.
I struggled with Windows XP box that I had imported using VMware Converter that only had an IDE drive. I tried deleting the hard drive (I was careful not to delete the underlying files), then I went to add the hard drive and set it to SCSI it would only allow IDE. I overcame this by shutting down the virtual machine, editing the relevant .vmdk file and changing the ddb.adapterType parameter to lsilogic like so:
ddb.adapterType = "lsilogic"
You should now be able to add the hard drive back in specifying the existing .vmdk file and set the SCSI adapter to "Paravirtual"
On a system that is already running and the VMware tools are installed. I ran all updates and it was simply a case of removing the existing network adapter and adding a new one of the type "VMXNET 3" and changing the SCSI adapter to "Paravirtual" and everything worked.
Update: Also check out this post on changing the IO scheduler on linux VMs squeezing more from your Linux VMs
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