Add a cache drive to normal storage spaces
It would be really handy if we could add SSD and NVMe drives to a normal Storage Space, as tiered/cache storage. Like you can in Storage Spaces Direct. Only less complex and less requirements...
Ideally, I'd like to be able to add them after the Storage Space has been created.
e.g. I currently have 4x4TB USB HDs in my storage space, to keep cost down, but it would be handy to put an SSD drive (internally connected, not USB) to provide performance.