I recently had an issue where my son informed me that Plex was no longer functioning.  I checked in UNRAID and discovered a whole lot of errors in the general log indicating that the cache drive is no longer writable and some codes that say "BTRFS: error (device loop2)"

 

I have plenty of space available on my cache drive (roughly 200GB) but for whatever reason it seems to be acting as if there is no space.

 

Anyone have any ideas what may be going on here?

tower-diagnostics-20190105-2109.zip

Cache fs is fully allocated, see here on how to solve:

https://lime-technology.com/forums/topic/62230-out-of-space-errors-on-cache-drive/?do=findComment&comment=610551

Also, loop2 is your docker image, which is probably corrupt, and which you have set to the ridiculously large 100G.

 

You will have to delete and recreate it, 20G should be more than sufficient. Maybe you used that large value because you were filling it. That is not the solution. You need to figure out what you are doing wrong with your docker apps that are filling it.

 

Have a look at the Docker FAQ, especially the section about Docker Image Filling Up.

 

 

Thank you guys.  I was able to successfully rebalance the Cache after deleting some files that were no longer necessary and abnormally huge (binhex-Krusader had like 50GB itself). Thank you @johnnie.black.  I am slowly reconstituting my dockers and managing there outputs carefully per @trurl's post.