It is also possible to use a PVSCSI-disk during OS-installation because it is located on a virtual floppy available on your host that you can select at the start of the Windows-installation by pressing F6 in the setup-screen. To use the Paravirtual SCSI-adapter (PVSCSI) you need to install the driver, which is automatically installed with the VMware tools so you can easily switch to this controller after installation. All operating systems support a Buslogic or LSI Logic adapter so that is the reason VMware uses that as these as the default. This adapter is not selected by default because your operating system (Windows) installation disc doesn't contain the driver for this VMware-adapter. This controller will provide greater throughput and lower CPU utilization for your VMkernel. There is however a Paravirtual SCSI-controller that can improve performance for your virtual machines, especially in environments with high IO-loads. Based on your choice of operating system VMware will offer a Buslogic or LSI logic adapter. VMware offers multiple types of virtual SCSI-adapters to use in your virtual machines.
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