Just updated to 6.2rc4. I was running 6.1.9. I previously had my docker.img and appdata on an SSD mounted with the unassigned devices plugin. The docker.img is not recognized now. I tried deleting it and recreating but it would not create a docker.img on the ssd. I put in the path to the ssd, click apply, and nothing happens.
I tried creating a docker.img on the cache drive and it was successful. I deleted that image and tried again on the ssd, but no luck. I'd rather use the SSD for dockers, otherwise the cache drive stays spun up all the time because of the dockers I use.
edit: I'm just going to use the SSD as a cache drive and add the former cache drive to the array.