Short version:
656G used (df -h)
450G used (du -sh)
10G used by snapshots
196G discrepancy <-----
I don't undertand what is using 196G.
df -h /mnt/dati/
File system Dim. Usati Dispon. Uso% Montato su
/dev/mapper/vg00-dati 919G 656G 262G 72% /mnt/dati
du -sh /mnt/dati/folder1,2,3
450G
I have a subvolume with 10 snapshots.
I know that 10G of data has been copied, so snapshots should hold no
more than 10G.
There's not a huge amount of metadata:
btrfs fi df /mnt/dati
Data, single: total=774.00GiB, used=654.42GiB
System, single: total=32.00MiB, used=92.00KiB
Metadata, single: total=2.00GiB, used=1007.42MiB
GlobalReserve, single: total=512.00MiB, used=0.00B
Why such a big difference between 'df -h' and 'du -sh' ?
uname -a
Linux cubo-ats 4.9.0-0.bpo.5-amd64 #1 SMP Debian
4.9.65-3+deb9u2~bpo8+1 (2017-01-05) x86_64 GNU/Linux
btrfs --version
btrfs-progs v4.7.3
btrfs fi show
Label: none uuid: f0a8ff89-608e-4ca2-bde9-8dc09b91accf
Total devices 1 FS bytes used 655.40GiB
devid 1 size 918.35GiB used 776.03GiB path /dev/mapper/vg00-dati
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