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/mnt/cache claims 83% utilized, but 130GB is unaccounted for

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Starting late July the utilization of my cache started growing to the point where I'm now getting alerts. From the console, it shows I'm using 384G, but when I use du it only shows 258GB in use. Where is my missing 130GB?

 

root@laffy:/mnt/cache# df -h .
Filesystem      Size  Used Avail Use% Mounted on
/dev/sdd1       466G  384G   82G  83% /mnt/cache

root@laffy:/mnt/cache# du -sh *
12K	T_Media
258G	appdata
249M	smokeping

 

I tried a reboot, but no change. I can't figure out was is using up disk space. The missing 130GB is about the amount of growth I've had since July.

 

laffy-diagnostics-20240903-0838.zip

  • Community Expert

The free space the GUI reports is correct, it's the same btrfs reports, and note that du is not reliable with btrfs, if you don't know what is using the extra space, you can start moving the data to another pool/array until you find out, vdisks are know to grow if they are not being trimmed, but looks like you don't have any.

  • Author

Yeah, I'm aware how du reports space differently compared to the filesystem itself, but was not expecting that much variation. There is only on subdirectory taking up that much space (/mnt/user/appdata/plex/Library/Application Support/Plex Media Server/Media) and suspect that might be it (130GB right now). Going to work on offloading that directory off of cache.

  • Author

I've moved that Plex Meda (metadata) directory to the array and monitoring for growth now.

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