DRS supports virtual flash as a resource.
DRS manages virtual machines with Flash Read Cache reservations. Every time DRS runs, it displays the available virtual flash capacity reported by the ESXi host. Each host supports one virtual flash resource. DRS selects a host that has sufficient available virtual flash capacity to start a virtual machine. DRS treats powered-on virtual machines with a Flash Read Cache as soft affined to their current host and moves them only for mandatory reasons or if necessary to correct host over-utilization.