On Sat, Feb 20, 2016 at 07:17:53PM -0900, Kent Overstreet wrote:

quoted

bcache0 is fine
bcache1 ended up in a bad state, I'm not sure how.
No biggie, right, just delete/recreate/re-register sda6, except how?

https://www.kernel.org/doc/Documentation/bcache.txt
SYSFS - CACHE DEVICE:
says nothing about how I can free/release sda6

saruman:~# echo /dev/sda6 > /sys/fs/bcache/unregister
-su: /sys/fs/bcache/unregister: Permission denied
is not helpful, nothing in kern.log

echo 1 > /sys/fs/bcache/<uuid>/unregister

If you look lower down in my Email, I did do almost the same:
saruman:/sys/fs/bcache/f419195d-184e-44b7-9f88-a834a5458f8c# echo 1 > stop

I was pointing out that for a newcomer, it's not all super obvious how
all the pieces fit together.

Is https://www.kernel.org/doc/Documentation/bcache.txt still considered
the canonical documentation?
I could try writing some kind of howto update for it if so.

Marc
-- 
"A mouse is a device used to point at the xterm you want to type in" - A.S.R.
Microsoft is to operating systems ....
                                      .... what McDonalds is to gourmet cooking
Home page: http://marc.merlins.org/                         | PGP 1024R/763BE901