[knot-resolver-users] non-persistent cache during system reboot although stored on persistent storage, why?

Hi, I am running knot-resolver-5.7.4 in a FreeBSD service jail (14.1-STABLE). Note: Because I am still pretty new to using knot resolver, I may miss something important besides [1]. MWN> sum /usr/home/jails/test/var/run/kresd/data.mdb 268 10240 /usr/home/jails/test/var/run/kresd/data.mdb MWN> ./_STATS [2] cache('['count_entries']'): 4953 cache('['usage_percent']'): 16.953125 ### stopping jail simulates shutdown server [3]: MWN> service jail stop test Stopping jails: test. MWN> sum /usr/home/jails/test/var/run/kresd/data.mdb 268 10240 /usr/home/jails/test/var/run/kresd/data.mdb ### Thus, data.mdb is preserved after shutdown! ### starting jail simulates booting server: MWN> service jail start test Starting jails: test. MWN> sum /usr/home/jails/test/var/run/kresd/data.mdb 15059 10240 /usr/home/jails/test/var/run/kresd/data.mdb MWN> ./_STATS cache('['count_entries']'): 87 cache('['usage_percent']'): 0.15625 1) After having stopped that jail, data.mdb is still available and hasn't been modified as shown by checksum. 2) After start of the jail including start of kresd data.mdb has been modified (checksum). 3) cache.stats() shows significantly lower numbers. Questions: #) become cache.stats() reset after a reboot? #) what am I missing? Thanks in advance and regards, Michael [1] https://knot-resolver.readthedocs.io/en/stable/daemon-bindings-cache.html#p… [2] _STATS (based on https://knot-resolver.readthedocs.io/en/stable/daemon-bindings-cache.html#c…) echo -n "cache('['count_entries']'): " ; echo "cache.stats()" | nc -NU /var/run/kresd/control/kresd.sock | grep count_entries echo -n "cache('['usage_percent']'): " ; echo "cache.stats()" | nc -NU /var/run/kresd/control/kresd.sock | grep usage_percent [3] a real server reboot shows the same issue with the cache