If a log file is too large and it cannot be deleted, truncate it:

truncate -s 0 /path/to/logfile

For larger files this might take some time. The 'trick' is also used by logrotate copytruncate

Hint: it might be possible that

ls -l logfile

still shows the wrong size, but a du -h in the folder is correct.

Refs:
https://linuxhandbook.com/empty-file-linux/

For services that cannot handle new file descriptors (old log file was closed, moved and a new was opened) it is mandatory to use

copytruncate

in the logrotate settings for a service! With this setting, the log file is copied to the “backup” and when this is done, the original log file, same descriptor, is truncated to a size of zero.

Keywords: logfile large disk space hd truncate logrotate