Possible Drive Failure? Nope, fully allocated cache pool despite free space being reported


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Ok, so it looks like all of my space is being eaten up by Plex cache files. Like 2 or 3 GB is eating up approx. 100GB! Is there something I should be doing to avoid this? I'm nearly finished offloading these cache drives to my main array but is reformatting my cache drives going to achieve anything if I put the Plex stuff back?

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Thank you. Back up and running. 

 

btrfs fi show /mnt/cache
Label: none  uuid: 1e328593-96c1-4e6c-9e25-7d0db9eb359d
        Total devices 2 FS bytes used 75.64GiB
        devid    1 size 232.89GiB used 88.03GiB path /dev/sdc1
        devid    2 size 232.89GiB used 88.03GiB path /dev/sdb1

btrfs fi df /mnt/cache  
Data, RAID1: total=86.00GiB, used=75.38GiB
System, RAID1: total=32.00MiB, used=16.00KiB
Metadata, RAID1: total=2.00GiB, used=272.55MiB
GlobalReserve, single: total=74.64MiB, used=0.00B
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Approx. 12 hours later...

root@Veyron:~# btrfs fi show /mnt/cache
Label: none  uuid: 1e328593-96c1-4e6c-9e25-7d0db9eb359d
        Total devices 2 FS bytes used 75.51GiB
        devid    1 size 232.89GiB used 118.03GiB path /dev/sdc1
        devid    2 size 232.89GiB used 118.03GiB path /dev/sdb1

root@Veyron:~# btrfs fi df /mnt/cache 
Data, RAID1: total=116.00GiB, used=75.21GiB
System, RAID1: total=32.00MiB, used=48.00KiB
Metadata, RAID1: total=2.00GiB, used=304.41MiB
GlobalReserve, single: total=99.08MiB, used=0.00B
root@Veyron:~# 

root@Veyron:~# btrfs balance start -dusage=75 /mnt/cache
Done, had to relocate 43 out of 119 chunks

root@Veyron:~# btrfs fi show /mnt/cache
Label: none  uuid: 1e328593-96c1-4e6c-9e25-7d0db9eb359d
        Total devices 2 FS bytes used 75.50GiB
        devid    1 size 232.89GiB used 78.03GiB path /dev/sdc1
        devid    2 size 232.89GiB used 78.03GiB path /dev/sdb1
root@Veyron:~# btrfs fi df /mnt/cache 
Data, RAID1: total=76.00GiB, used=75.20GiB
System, RAID1: total=32.00MiB, used=16.00KiB
Metadata, RAID1: total=2.00GiB, used=300.88MiB
GlobalReserve, single: total=96.36MiB, used=0.00B
root@Veyron:~# 

 

I'm thinking I need to do that nightly. :/ The system does get used though.

 

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