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btrfs cache pool - system/docker/btrfs/subvolumes - takes up a lot of space ~70gb (11 Containers).

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Hiya,

 

I'm using Docker folder instead of docker.img. I've recently realised that this directory has about 64gb of stuff in it after a directory wipe and docker re-install. I've read through this post:

 

 

It has some good information in there, however the 'fix' doesn't seem to work for me. I wiped the docker folder using the webui, and re-created it. One by one i installed my dockers and each time, the space used by the directory went up significantly.

 

For example, rough figures of space used:

Duplicacy - 200mb

Firefox - 9gb

sftpgo - 3gb

UptimeKuma - 4gb

Remmina - 15gb

 

etc.

 

So immediately upon re-installing the dockers there is the space used.

 

I don't *think* there's anything wrong with my Docker mappings, either in the configs or in the tool/s themselves. Everything seems to work ok.

nas-diagnostics-20240715-1220.zip

Edited by Derek_

Solved by Kilrah

  • Derek_ changed the title to btrfs cache pool - system/docker/btrfs/subvolumes - takes up a lot of space ~70gb (11 Containers).
  • Community Expert
  • Solution

If you used du it's simply inaccurate due to the way layers work, it'll end up counting the same thing many times over. 

  • Author

I did use DU. Is there an accurate way to check it?

  • Community Expert

Not that I know of, other than using an image instead of a folder.

I have a 60GB image with about 20% free, if I run du in the mounted folder I get something ridiculous like 450GB that obviously isn't correct.

 

 

  • Author

OK, thanks for replying :)

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