So you decide to buy a SSD disk to start using virtual flash "Virtual Flash Read Cache allows you to locally cache virtual machine read I/O on an ESXi host and even migrate that virtual machines cache to another Virtual Flash enabled ESXi host." This is how you configure it. Add the SSD capacity to your ESXi Host. Do this by logging in to the vSphere Web Client and navigate to Host and cluster. Select your ESXi Host and select Manage - Settings. Under 'Virtual Flash' you find 'Virtual Flash Resource Management'. Click the 'Add Capacity' button and select your SSD disk. [...]