I made a fresh install of ubuntu 20.04 on my desktop, and then, from within the installation, created a bcache device to put my /home
sudo make-bcache -C /dev/sdb4 -B /dev/sda1
Where /dev/sdb is the ssd and /dev/sda is the hdd. But after doing so, editing fstab, and transferring the data into the partition, I realized that I never set it to --writeback mode or specified the cache replacement policy
make-bcache --help
Usage: make-bcache [options] device
-C, --cache Format a cache device
-B, --bdev Format a backing device
-b, --bucket bucket size
-w, --block block size (hard sector size of SSD, often 2k)
-o, --data-offset data offset in sectors
--cset-uuid UUID for the cache set
--writeback enable writeback
--discard enable discards
--cache_replacement_policy=(lru|fifo)
-h, --help display this help and exit
Is it possible to change the configuration of my existing bcache to do that without losing data or would I be better starting over?