On Mon, Oct 15, 2018 at 02:26:41PM +0000, Hugo Mills wrote:
> On Mon, Oct 15, 2018 at 05:24:08PM +0300, Anton Shepelev wrote:
> > Hello, all
> > 
> > While trying to resolve free space problems, and found that
> > I cannot interpret the output of:
> > 
> > > btrfs filesystem show
> > 
> > Label: none  uuid: 8971ce5b-71d9-4e46-ab25-ca37485784c8
> >         Total devices 1 FS bytes used 34.06GiB
> >         devid    1 size 40.00GiB used 37.82GiB path /dev/sda2
> > 
> > How come the total used value is less than the value listed
> > for the only device?
> 
>    "Used" on the device is the mount of space allocated. "Used" on the

s/mount/amount/

> FS is the total amount of actual data and metadata in that allocation.
> 
>    You will also need to look at the output of "btrfs fi df" to see
> the breakdown of the 37.82 GiB into data, metadata and currently
> unused.
> 
>    See https://btrfs.wiki.kernel.org/index.php/FAQ#Understanding_free_space.2C_using_the_original_tools for the details.
> 
>    Hugo.
> 

-- 
Hugo Mills             | "Your problem is that you have a negative
hugo@... carfax.org.uk | personality."
http://carfax.org.uk/  | "No, I don't!"
PGP: E2AB1DE4          |                              Londo and Vir, Babylon 5