rst status says cach-mode: off ??

Hi, after updating to windows 10 i reconfigured the ssd caching with the intel rst interface IAStoreUI.exe. In the performance tab it tells me caching is configured, but in the status tab, if i click on extended it says cach-mode: off. Does that mean the caching doesnt work, or only write caching doesnt work? I think it shoul read write-throug or write-back. thanks, Andi