When setting up a new SSD Hyper Cache, I am only presented with 2 options (Read-Write, Balanced) and no 3rd option to create a READ-ONLY cache.

I would really like to create a READ-ONLY Hyper Cache, as I previously had in TOS 5. Has the option to create a READ-ONLY Hyper Cache been removed in TOS 6? Or is this a bug?
Thanks!