# df -H
Filesystem Size Used Avail Use% Mounted on
...
/dev/bcache4 8.1T 1.9T 0 100% /mnt/8t4
# btrfs fi df -H /mnt/8t4
Data, single: total=1.84TB, used=1.82TB
System, DUP: total=33.55MB, used=212.99kB
Metadata, DUP: total=2.15GB, used=1.91GB
GlobalReserve, single: total=536.87MB, used=0.00B
# btrfs fi usage /mnt/8t4
Overall:
Device size: 7.28TiB
Device allocated: 1.67TiB
Device unallocated: 5.60TiB
Device missing: 0.00B
Used: 1.66TiB
Free (estimated): 5.62TiB (min: 2.81TiB)
Data ratio: 1.00
Metadata ratio: 2.00
Global reserve: 512.00MiB (used: 0.00B)
Data,single: Size:1.67TiB, Used:1.66TiB (99.26%)
/dev/bcache4 1.67TiB
Metadata,DUP: Size:2.00GiB, Used:1.78GiB (88.98%)
/dev/bcache4 4.00GiB
System,DUP: Size:32.00MiB, Used:208.00KiB (0.63%)
/dev/bcache4 64.00MiB
Unallocated:
/dev/bcache4 5.60TiB
I've tried various balances but they didn't help. There are two fairly recent snapshots on the fs.
How do I make Btrfs realize there's ~6TB of free space?