You can aggregate local flash devices on an ESXi host into a single virtualized caching layer called virtual flash resource.

When you set up the virtual flash resource, you create a new file system, Virtual Flash File System (VFFS). VFFS is a derivative of VMFS, which is optimized for flash devices and is used to group the physical flash devices into a single caching resource pool. As a non-persistent resource, it cannot be used to store virtual machines.

The following vSphere functionalities require the virtual flash resource:

Before setting up the virtual flash resource, make sure that you use devices approved by the VMware Compatibility Guide.