using pihole & unbound on Rpi3-B+. i had configured unbound to write logs to /var/log/unbound, verbosity: 2. the logs gets rather large so i put in a USB stick formatted with ext4 and changed unbound config to put its log files there. but i’m getting errors when unbound attempts to write to USB stick:
syslog:: unbound:  unbound[816:0] error: Could not open logfile /mnt/USB1/log/unbound.log: Permission denied
the perms on /mnt/USB1/log is:
Access: (0770/drwxrwx—) Uid: ( 0/ root) Gid: ( 112/ unbound)
unbound group has perms to write there, so how can i get unbound to actually write to the USB stick and stop this error?