That log seems a bit tough as it looks like 2 rclone processes are writing to it.
This guy seems normal and this should write a 'clean' message every 1 minute based on the default cleaning interval of one minute.
2021/01/10 13:49:41 DEBUG : rclone: Version "v1.53.3" starting with parameters ["rclone" "mount" "fyse:fyse" "/home/fyse" "--allow-other" "--dir-cache-time=4h" "--log-file" "/root/rclone.log" "--poll-interval=15s" "--umask" "002" "--user-agent" "fyse" "--cache-dir=/root/drive-cache" "--vfs-cache-mode" "full" "--vfs-cache-max-size=100G" "--vfs-cache-max-age=4h" "-vv"]
This would be the flag to change that one minute and I don't see it set:
--vfs-cache-poll-interval duration Interval to poll the cache for stale objects. (default 1m0s)
You have one process writing at 42 seconds and one process writing at 14 seconds every minute:
2021/01/11 21:09:42 INFO : vfs cache: cleaned: objects 60 (was 60) in use 60, to upload 0, uploading 0, total size 104.026G (was 104.026G)
2021/01/11 21:10:14 INFO : vfs cache: cleaned: objects 0 (was 0) in use 0, to upload 0, uploading 0, total size 0 (was 0)
2021/01/11 21:10:42 INFO : vfs cache: cleaned: objects 60 (was 60) in use 60, to upload 0, uploading 0, total size 104.052G (was 104.052G)
2021/01/11 21:11:14 INFO : vfs cache: cleaned: objects 0 (was 0) in use 0, to upload 0, uploading 0, total size 0 (was 0)
2021/01/11 21:11:42 INFO : vfs cache: cleaned: objects 60 (was 60) in use 60, to upload 0, uploading 0, total size 104.061G (was 104.061G)
2021/01/11 21:12:14 INFO : vfs cache: cleaned: objects 0 (was 0) in use 0, to upload 0, uploading 0, total size 0 (was 0)
2021/01/11 21:12:42 INFO : vfs cache: cleaned: objects 60 (was 60) in use 60, to upload 0, uploading 0, total size 104.070G (was 104.070G)
2021/01/11 21:13:14 INFO : vfs cache: cleaned: objects 0 (was 0) in use 0, to upload 0, uploading 0, total size 0 (was 0)
2021/01/11 21:13:42 INFO : vfs cache: cleaned: objects 60 (was 60) in use 60, to upload 0, uploading 0, total size 104.131G (was 104.131G)
2021/01/11 21:14:14 INFO : vfs cache: cleaned: objects 0 (was 0) in use 0, to upload 0, uploading 0, total size 0 (was 0)
2021/01/11 21:14:42 INFO : vfs cache: cleaned: objects 60 (was 60) in use 60, to upload 0, uploading 0, total size 104.157G (was 104.157G)
2021/01/11 21:15:14 INFO : vfs cache: cleaned: objects 0 (was 0) in use 0, to upload 0, uploading 0, total size 0 (was 0)
2021/01/11 21:15:42 INFO : vfs cache: cleaned: objects 60 (was 60) in use 60, to upload 0, uploading 0, total size 104.183G (was 104.183G)
2021/01/11 21:16:14 INFO : vfs cache: cleaned: objects 0 (was 0) in use 0, to upload 0, uploading 0, total size 0 (was 0)
2021/01/11 21:16:42 INFO : vfs cache: cleaned: objects 60 (was 60) in use 60, to upload 0, uploading 0, total size 104.218G (was 104.218G)
2021/01/11 21:17:14 INFO : vfs cache: cleaned: objects 0 (was 0) in use 0, to upload 0, uploading 0, total size 0 (was 0)
2021/01/11 21:17:42 INFO : vfs cache: cleaned: objects 60 (was 60) in use 60, to upload 0, uploading 0, total size 104.227G (was 104.227G)
2021/01/11 21:18:14 INFO : vfs cache: cleaned: objects 0 (was 0) in use 0, to upload 0, uploading 0, total size 0 (was 0)
If you see "RemoveNotInUse" in the debug log, that means the file was removed from cache because it's not being used.
There are a lot of those:
grep "RemoveNotInUse" rclone.log |wc -l
71319
So that 71k times a file was removed from the cache.
Your last couple lines look very normal as well as you can see things removing and you still have a lot of files in use in the cache.
2021/01/11 21:17:42 DEBUG : vfs cache RemoveNotInUse (maxAge=14400000000000, emptyOnly=false): item Star Wars Episode 3 - Revenge of the Sith (2005).mp4 not removed, freed 0 bytes
2021/01/11 21:17:42 DEBUG : vfs cache RemoveNotInUse (maxAge=14400000000000, emptyOnly=false): item Inside Out (2015).mp4 not removed, freed 0 bytes
2021/01/11 21:17:42 DEBUG : vfs cache RemoveNotInUse (maxAge=14400000000000, emptyOnly=false): item Underwater (2020).mp4 not removed, freed 0 bytes
2021/01/11 21:17:42 DEBUG : vfs cache RemoveNotInUse (maxAge=14400000000000, emptyOnly=false): item Ready or Not (2019).mp4 not removed, freed 0 bytes
2021/01/11 21:17:42 DEBUG : vfs cache RemoveNotInUse (maxAge=14400000000000, emptyOnly=false): item We're the Millers (2013).mp4 not removed, freed 0 bytes
2021/01/11 21:17:42 DEBUG : vfs cache RemoveNotInUse (maxAge=14400000000000, emptyOnly=false): item Star Wars: The Clone Wars (2008).mp4 not removed, freed 0 bytes
2021/01/11 21:17:42 INFO : vfs cache: cleaned: objects 60 (was 60) in use 60, to upload 0, uploading 0, total size 104.227G (was 104.227G)
What do you think should be happening that isn't?