If you connect another virtual disk to the second storage controller, the number of the disk is (1:1) in this case. If you add a second virtual disk to the same controller, then the number is (0:1). For example, if your VM has one storage controller and one virtual disk attached to this controller, the disk is numbered as (0:0). The numbering of storage devices connected to a storage controller similarly starts at 0. The controllers afterward are numbered sequentially. If you add a second storage controller, the assigned number is 1, etc.
The default number of the first storage controller on a VM is 0. Other storage controller types require a cold operation, that is, powering off the VM first. Some controllers can be added to a VM configuration by using the hot-add feature. In that case, how a new controller is added becomes important. Hence, if more than one SCSI controller is used for a VM, the recommended practice is to distribute virtual disks across these SCSI controllers for better performance.Īnother reason to add a storage controller is when you exceed the maximum supported number of disk devices connected to a controller. When you connect storage devices to multiple storage controllers, input/output performance can be increased compared to connecting all disk drives to a single storage controller. Newer hardware versions support more storage controllers.īefore changing the storage controller used for a boot disk, you should ensure that the guest operating system (OS) supports this controller type and that the appropriate drivers are installed in the guest OS. Virtual machine hardware compatibility (VMware hardware version) and device type (virtual hard disk or DVD-ROM) are also important factors. For that reason, the drivers included in the chosen guest OS should be taken into account in order to select the best default controller. Newer storage controller types might not be supported in older operating systems. The importance of selecting the right storage controller cannot be emphasized enough. As we shall see, this makes selecting the appropriate guest OS in the VM creation wizard a very important task. When you create a virtual machine on an ESXi host by using VMware Host Client or VMware vSphere Client, or in VMware Workstation, the optimal storage controller is selected automatically to provide the best performance for the selected guest operating system. You can also add more storage controllers to connect disk drives when creating the VM. If a virtual disk and CD/DVD drive are connected to different storage controllers, then you can have two storage controllers after creating the VM. When you create a VMware vSphere VM, at least one virtual storage controller is created by default in the VM configuration.
DISCOVER SOLUTION General Information About Storage Controllers
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