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BTRFS cache pool out of space

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I was trying to delete some files from my cache pool and I started to see messages about failing due to out of space.  How can I fix this?

 

root@unRAID:/mnt/cache# btrfs filesystem show /dev/sdd1
Label: none  uuid: f5497a6f-06d0-4702-b941-f18cd1acac53
        Total devices 3 FS bytes used 64.52GiB
        devid    1 size 119.24GiB used 118.02GiB path /dev/sdb1
        devid    2 size 3.97MiB used 0.00B path /dev/sdc1
        devid    3 size 119.24GiB used 118.00GiB path /dev/sdd1

Btrfs v3.17.2

 

root@unRAID:~# btrfs fi df /mnt/cache
Data, single: total=234.01GiB, used=63.95GiB
System, single: total=4.00MiB, used=48.00KiB
Metadata, single: total=2.01GiB, used=314.78MiB
GlobalReserve, single: total=112.00MiB, used=0.00B

 

Are deletes written to "garbage" and I need to empty that somehow?  I just deleted a 75GB VM and it did me no good.  Is the solution to run a "balance"?

 

John

 

 

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