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
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