1 disco rígido hd e 1 SSD com cache de leitura

1. Formate o dispositivo de backup
(normalmente será sua unidade mecânica). 
O dispositivo de backup pode ser um dispositivo inteiro, 
uma partição ou qualquer outro dispositivo de bloco padrão. 

Isso criará /dev/bcache0.

# make-bcache -B /dev/sd-hd

2. Formate o dispositivo de cache 
(normalmente será o seu SSD). 
O dispositivo de cache pode ser um dispositivo inteiro, 
uma partição ou qualquer outro dispositivo de bloco padrão.

# make-bcache -C /dev/sd-ssd

###################################################################
cat /sys/block/bcache0/bcache/state
#
echo "UUID do set UUID: do SSD" > /sys/block/bcache0/bcache/attach
#
echo writeback > /sys/block/bcache0/bcache/cache_mode
#
echo "all" > /sys/block/bcache0/bcache/readahead_cache_policy 
#
mkfs.ext4 /dev/bcache0
#
cat /sys/block/bcache0/bcache/state
#
mkdir /mnt/cache
#
mount /dev/bcache0 /mnt/cache
#
df -hT
###################################################################
#
# Set writeback cache mode
echo writeback > /sys/block/bcache0/bcache/cache_mode

# Check the current cache mode
cat /sys/block/bcache0/bcache/cache_mode

# Set sequential I/O threshold to 0 (disable detection)
echo 0 > /sys/block/bcache0/bcache/sequential_cutoff

# Set writeback percentage to 50%
echo 50 > /sys/block/bcache0/bcache/writeback_percent
#
################################################
mkdir -p /mnt/ramdisk
#
mount -t tmpfs -o size=2G tmpfs /mnt/ramdisk
#
losetup -f
#
dd if=/dev/zero of=/mnt/ramdisk/cache_ram bs=1M count=2000
#
losetup /dev/loop2 /mnt/ramdisk/cache_ram 
#
make-bcache -B /dev/sd-hd -C /dev/loop2
################################################

###########
meu bcache
###########
#
mount -t tmpfs -o size=3G tmpfs /mnt/ramdisk
#
dd if=/dev/zero of=/mnt/ramdisk/bcache_origin bs=1M count=1000
#
losetup /dev/loop2 /mnt/ramdisk/bcache_origin
#
make-bcache -B /dev/sd-hd -C /dev/loop2
#######
#
###########################################################
mount -t tmpfs -o size=2G tmpfs /mnt/ramdisk
#
dd if=/dev/zero of=/mnt/ramdisk/cache_ram bs=1M count=2000
#
losetup /dev/loop2 /mnt/ramdisk/cache_ram
#
mkfs.ext4  /dev/loop2
#
mount /dev/loop2 /mnt/usb2/
#
hdparm -t /dev/loop2
###########################################################