Stopping Bcache

Before disabling smart prefetch, stop the cluster service program.

Stop the bcache RAM drive.
1. Detach the cache drive.
```
echo 1 > /sys/block/[bcache]/bcache/detach
```
2. Deregister the cache drive.
```
echo 1 > /sys/fs/bcache/[uuid]/unregister
```
3. Delete the RAM drive.
```
modprobe -r brd
```
  In the previous command, note the following for [bcache] and [uuid]:
  
  [bcache] is subject to the content of the /sys/block/ directory. All bcache devices in the directory must be processed in the same way.
  Set the [uuid] value in the command based on the content in the /sys/fs/bcache directory. All UUID devices in the directory must be processed in the same way.
Stop the bcache SSD.
1. Detach the cache drive.
```
echo 1 > /sys/block/[bcache]/bcache/detach
```
2. Deregister the cache drive.
```
echo 1 > /sys/fs/bcache/[uuid]/unregister
```
  In the previous command, note the following for [bcache] and [uuid]:
  
  [bcache] is subject to the content of the /sys/block/ directory. All bcache devices in the directory must be processed in the same way.
  Set the [uuid] value in the command based on the content in the /sys/fs/bcache directory. All UUID devices in the directory must be processed in the same way.
Unmount the data drive that needs to be formatted as a bcache drive.
```
umount /data/[data]
```
Replace the unmount directory [data] with the actual name.
Stop the bcache drive.
```
echo 1 > /sys/block/[bcache]/bcache/stop
```
[bcache] is subject to the content of the /sys/block/ directory. All bcache devices in the directory must be processed in the same way.
Uninstall the bcache driver.
```
modprobe -r bcache
```

Parent topic: Disabling the Big Data Smart Prefetch