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Cache wont complete flush

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I just noticed today, that my cache isnt completely emptying. The BTRFS Data gets stuck at ~16GB usage. 

Any ideas on how to resolve, or do I need to reboot? 




root@TOWER:~# btrfs device usage /mnt/cache
/dev/nvme2n1p1, ID: 1
   Device size:           465.76GiB
   Device slack:              0.00B
   Data,single:            16.00GiB
   Metadata,single:         1.00GiB
   System,single:          32.00MiB
   Unallocated:           448.73GiB
root@TOWER:~# btrfs scrub start /mnt/cache
scrub started on /mnt/cache, fsid c20831e7-b715-430c-9d21-3fff9f3daae4 (pid=27825)
root@TOWER:~# btrfs scrub status /mnt/cache
UUID:             c20831e7-b715-430c-9d21-3fff9f3daae4
Scrub started:    Thu Dec 15 20:23:05 2022
Status:           finished
Duration:         0:00:04
Total to scrub:   15.82GiB
Rate:             3.96GiB/s
Error summary:    no errors found
root@TOWER:~# btrfs filesystem df /mnt/cache
Data, single: total=16.00GiB, used=15.81GiB
System, single: total=32.00MiB, used=16.00KiB
Metadata, single: total=1.00GiB, used=17.89MiB
GlobalReserve, single: total=20.45MiB, used=0.00B
root@JARSKYNAS:~# btrfs filesystem du -s /mnt/cache
     Total   Exclusive  Set shared  Filename
     0.00B       0.00B       0.00B  /mnt/cache
root@TOWER:~# ls -la /mnt/cache
total 16
drwxrwxrwx  1 nobody users  20 Dec 14 17:30 ./
drwxr-xr-x 19 root   root  380 Dec 14 17:20 ../
drwxrwxrwx  1 nobody users   0 Dec 15 19:47 tdarr-temp/
root@JARSKYNAS:~# ls -la /mnt/cache/tdarr-temp/
total 16
drwxrwxrwx 1 nobody users  0 Dec 15 19:47 ./
drwxrwxrwx 1 nobody users 20 Dec 14 17:30 ../


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  • Solution

I disabled the cache for all shares and moved the tdarr-temp share away from it (which was Cache only), deleted the tdarr-temp folder (even though it was empty), and ran the mover again and it cleared it this time. Moved the folder back to the cache and re-enabled it and its been fine since. 


Not sure what happened but for some reason the BTRFS Data "partition" just stayed as this "Data, single: total=16.00GiB, used=15.81GiB" even with multiple balance attempts. 

Sorted now though


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