If you add a hard disk, SCSI, or CD/DVD-ROM device to a virtual machine after virtual machine creation, the device is assigned to the first available virtual device node on the default controller, for example (0:1). When you add storage controllers, they are numbered sequentially 1, 2, and 3. When you create a virtual machine, the default hard disk is assigned to the default controller 0 at bus node (0:0). The default SCSI or SATA controller is 0. Įach virtual machine can have a maximum of four SCSI controllers and four SATA controllers. For platform support for VMware Paravirtual SCSI controllers, see the VMware Compatibility Guide at. The VMware Paravirtual SCSI controller ensures greater throughput and lower CPU use, which boosts performance as compared to the other SCSI controller options. In high performance storage environments you can benefit from using VMware Paravirtual SCSI controllers. When you create virtual machines with Windows Vista and later guests, a SCSI controller is the default for the hard disk and a SATA controller is the default for the CD/DVD drive. For example, when you create virtual machines with Apple Mac OS X guests and ESXi 5.5 and later compatibility, the default controller type for both the hard disk and the CD/DVD drive is SATA. The controller type depends on the guest operating system, the device type, and sometimes, the virtual machine's compatibility. When you create a virtual machine, the default controller is optimized for best performance. For more information, see the vSphere Storage documentation. ESXi supports the NVMe protocol to connect to local and networked storage devices. NVMe is a standartized protocol designed specifically for high-performance multi-queue communication with NVM devices. AHCI, SATA, and NVM Express (NVMe) controllers are also available. Storage controllers appear to a virtual machine as different types of SCSI controllers, including BusLogic Parallel, LSI Logic Parallel, LSI Logic SAS, and VMware Paravirtual SCSI. If you know about node behavior, controller limitations, and compatibility of different types of controllers before you change or add a controller, you can avoid potential boot problems. You can make these changes while you are in the creation wizard. You can add additional controllers or change the controller type after virtual machine creation.

To access virtual disks, CD/DVD-ROM, and SCSI devices, a virtual machine uses storage controllers, which are added by default when you create the virtual machine.

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