Cannot attach cache device to backing device

I have an LVM and I wanted to use bcache to cache one of its LVs. (Yes, I know I could use lvmcache, but I was having issues booting and I gave up using it.) First, I used blocks to convert the LV to a bcache backing device (this seemed to actually work!): blocks to-bcache /dev/my_vg/my_lv I created a caching device on my SSD: make-bcache --block 4k --bucket 2M -C /dev/sdc4 I then attempted to attach the cache to the backing device: bcache-super-show /dev/sdc4 | grep cset.uuid echo 'above_uuid' > /sys/block/bcache0/bcache/attach I then rebooted my machine (after adding /dev/bcache0 to /etc/fstab) and realized that the cache wasn't running. # cat /sys/block/bcache0/bcache/state no cache # bcache-super-show /dev/my_vg/my_lv | grep cache_state dev.data.cache_state 0 [detached] Am I missing something? Is there another command I need to use to enable caching? Why does bcache not like my cache device and not letting me attach it to my backing device? Did I use the wrong values for --block and --bucket?