just a heads up, I believe ca.mover.tuner caused instability in the parity write during a large extended move (mover was moving and files were being written to cache as fast as it could move, resulting in a "move" run of about 4 hours). I ignored the warning that it was incompatible. I am running 6.9.0-RC1 with multiple cache pools. HDD checked out fine on smart and is happily rebuilding for an hour so far. needless to say, i've uninstalled it until it is updated. I would not recommend running until its sorted.