If your caching I/O filter uses local flash devices, configure a virtual flash resource, also known as VFFS volume. You configure the resource on your ESXi host before activating the filter.
- In the vSphere Web Client, navigate to the host.
- Click the Configure tab.
- Under Virtual Flash, select Virtual Flash Resource Management and click Add Capacity.
- From the list of available flash drives, select one or more drives to use for the virtual flash resource and click OK.