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This is an issue if you plan on caching your root device. A basic setup guide: -------------------- Create a backing device: This formats the partition HDD1 and creates /dev/bcache0. $ make-bcache -B /dev/HDD1 Create a caching device, copy the `Set UUID' for later. $ make-bcache -C /dev/SSD1 Connect the two; this only needs to be done once: $ echo "Set UUID" > /sys/block/bcache0/bcache/attach You probably want write-back caching, otherwise only reads will be sped up. Note that this means a dead SSD could result in data loss. $ echo writeback > /sys/block/bcache0/bcache/cache_mode Find the UUID of the device: $ ls /dev/disk/by-uuid -l | grep bcache0 Use this UUID in /etc/fstab since the /dev/bcacheX number may change when a second bcache device is created. -- David Mohr Wed, 26 Mar 2014 00:09:49 -0600