I want to know how many free space is left and have problems in
interpreting the output of:
btrfs filesystem usage
btrfs filesystem df
btrfs filesystem show
In detail:
root@diaspora:~# btrfs filesystem usage /local
Overall:
Device size: 883.51GiB
Device allocated: 825.51GiB
Device unallocated: 58.00GiB
Device missing: 0.00B
Used: 494.45GiB
Free (estimated): 387.94GiB (min: 387.94GiB)
Data ratio: 1.00
Metadata ratio: 1.00
Global reserve: 320.00MiB (used: 0.00B)
Data,single: Size:823.47GiB, Used:493.53GiB
/dev/sda4 823.47GiB
Metadata,single: Size:2.01GiB, Used:938.67MiB
/dev/sda4 2.01GiB
System,single: Size:32.00MiB, Used:128.00KiB
/dev/sda4 32.00MiB
Unallocated:
/dev/sda4 58.00GiB
root@diaspora:~# btrfs filesystem df /local
Data, single: total=823.47GiB, used=493.53GiB
System, single: total=32.00MiB, used=128.00KiB
Metadata, single: total=2.01GiB, used=938.67MiB
GlobalReserve, single: total=320.00MiB, used=0.00B
root@diaspora:~# btrfs filesystem show /local
Label: 'local' uuid: 11faaa39-5805-4e92-a891-e8ceb4afa9f7
Total devices 1 FS bytes used 494.45GiB
devid 1 size 883.51GiB used 825.51GiB path /dev/sda4
What does the last line mean?
825.51GiB used = allocated by (file) data?
In this case I would have only 58 GB free disk space left?
"btrfs filesystem usage" says 494 GB used, but
"btrfs filesystem show" says 825 GB used?!
The man pages do not explain the different meanings of "used" and
"allocated"
And at last:
root@diaspora:~# df -HT /local
Filesystem Type Size Used Avail Use% Mounted on
/dev/sda4 btrfs 949G 532G 417G 57% /local
--
Ullrich Horlacher Server und Virtualisierung
Rechenzentrum TIK
Universitaet Stuttgart E-Mail: horlacher@xxxxxxxxxxxxxxxxxxxx
Allmandring 30a Tel: ++49-711-68565868
70569 Stuttgart (Germany) WWW: http://www.tik.uni-stuttgart.de/
REF:<20181029181141.GA31256@xxxxxxxxxxxxxxxxxxxx>
