System.IO.IOException: No space left on device

[CleverId10t]

ncdu is good for finding where space is used

https://dev.yorhel.nl/ncdu

other software is available

[OreoCollas]

Mine are so much smaller than yours but still the drive is full?

jellyfin@jellyfin:~$ du -sh /var/lib/jellyfin /var/cache/jellyfin
2.3G /var/lib/jellyfin
14M /var/cache/jellyfin

[TheDreadPirate]

The OS takes up space as well. And, if you are transcoding, those would get written to disk. /var/lib/jellyfin/transcodes, by default. If transcodes are the culprit, Dashboard > Playback has a setting to change where transcodes are written.

Or increase the size of the root volume again.