I’m running Syncthing on an odroid C4 with 32GB emmc and an 8TB USB connected drive. After installing and running Syncthing for a half hour or so, I get this error:
2025-09-09 03:01:38: Saving config: write /storage/.kodi/userdata/addon_data/service.system.syncthing/.syncthing.tmp.793318938: no space left on device
Is there a way I can configure Syncthing to store temporary files on the external 8TB SSD?
Thanks for the response. I probably should have clarified I’m running v1.30.0 as I’d like to wait a while for 2.x
The temp files must be on the same filesystem as the directory beeing synced, as the rename to the original filename has to be atomic.
I believe you are incorrect. The file …/.syncthing.tmp.793318938 isn’t of the form .syncthing.original-filename.ext.tmp as described in Understanding Synchronization — Syncthing documentation . I believe this is a different Syncthing temporary file, not a file that is in the process of being synced.
I ignored the "Saving config” part 
. The config file has only a few KB, if there is not enough space for that, than you have other problems. It is very likely, that the atomic rename also applies to the config file.
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