OS 6.1.6 daemon.log filling up root space

I have RN4220 with OS 6.1.6 installed recently, and I just noticed yesterday when it was giving me message saying the root space is filling up quickly(more than 80% used), and I found out that raidard and avahi-daemon has been constantly writing to daemon.log with the following message.

Feb 27 11:17:56 rn4220 raidard[23108]: quitting on signal 15...
Feb 27 11:17:57 rn4220 raidard[23126]: got 1 interfaces:
Feb 27 11:17:57 rn4220 raidard[23126]: IP=10.6.56.159 Mac=44:94:fc:6e:be:fa BroadAddress=10.6.56.255
Feb 27 11:17:57 rn4220 avahi-daemon[23117]: Service "rn4220" (/services/nut.service) successfully established.
Feb 27 11:17:57 rn4220 avahi-daemon[23117]: Service "ReadyNAS Administration on rn4220" (/services/frontview.service) successfully established.
Feb 27 11:17:59 rn4220 avahi-daemon[23117]: Got SIGTERM, quitting.
Feb 27 11:17:59 rn4220 avahi-daemon[23117]: Leaving mDNS multicast group on interface eth0.IPv6 with address fe80::4694:fcff:fe6e:befa.
Feb 27 11:17:59 rn4220 avahi-daemon[23117]: Leaving mDNS multicast group on interface eth0.IPv4 with address 10.6.56.159.
Feb 27 11:17:59 rn4220 avahi-daemon[23117]: avahi-daemon 0.6.31 exiting.
Feb 27 11:17:59 rn4220 avahi-daemon[23137]: Process 23117 died: No such process; trying to remove PID file. (/var/run/avahi-daemon//pid)
Feb 27 11:17:59 rn4220 avahi-daemon[23137]: Found user 'avahi' (UID 84) and group 'avahi' (GID 84).
Feb 27 11:17:59 rn4220 avahi-daemon[23137]: Successfully dropped root privileges.
Feb 27 11:17:59 rn4220 avahi-daemon[23137]: avahi-daemon 0.6.31 starting up.
Feb 27 11:17:59 rn4220 avahi-daemon[23137]: WARNING: No NSS support for mDNS detected, consider installing nss-mdns!
Feb 27 11:17:59 rn4220 avahi-daemon[23137]: Successfully called chroot().
Feb 27 11:17:59 rn4220 avahi-daemon[23137]: Successfully dropped remaining capabilities.
Feb 27 11:17:59 rn4220 avahi-daemon[23137]: Loading service file /services/frontview.service.
Feb 27 11:17:59 rn4220 avahi-daemon[23137]: Loading service file /services/nut.service.
Feb 27 11:17:59 rn4220 avahi-daemon[23137]: Joining mDNS multicast group on interface eth0.IPv6 with address fe80::4694:fcff:fe6e:befa.
Feb 27 11:17:59 rn4220 avahi-daemon[23137]: New relevant interface eth0.IPv6 for mDNS.
Feb 27 11:17:59 rn4220 avahi-daemon[23137]: Joining mDNS multicast group on interface eth0.IPv4 with address 10.6.56.159.
Feb 27 11:17:59 rn4220 avahi-daemon[23137]: New relevant interface eth0.IPv4 for mDNS.
Feb 27 11:17:59 rn4220 avahi-daemon[23137]: Network interface enumeration completed.
Feb 27 11:17:59 rn4220 avahi-daemon[23137]: Registering new address record for fe80::4694:fcff:fe6e:befa on eth0.*.
Feb 27 11:17:59 rn4220 avahi-daemon[23137]: Registering new address record for 10.6.56.159 on eth0.IPv4.
Feb 27 11:17:59 rn4220 upnphttpd[23142]: /usr/sbin/upnphttpd is started
Feb 27 11:17:59 rn4220 avahi-daemon[23137]: Server startup complete. Host name is rn4220.local. Local service cookie is 3526706216.
Feb 27 11:18:00 rn4220 raidard[23126]: quitting on signal 15...
Feb 27 11:18:00 rn4220 raidard[23145]: got 1 interfaces:
Feb 27 11:18:00 rn4220 raidard[23145]: IP=10.6.56.159 Mac=44:94:fc:6e:be:fa BroadAddress=10.6.56.255
Feb 27 11:18:00 rn4220 avahi-daemon[23137]: Service "rn4220" (/services/nut.service) successfully established.
Feb 27 11:18:00 rn4220 avahi-daemon[23137]: Service "ReadyNAS Administration on rn4220" (/services/frontview.service) successfully established.
Feb 27 11:18:02 rn4220 avahi-daemon[23137]: Got SIGTERM, quitting.
Feb 27 11:18:02 rn4220 avahi-daemon[23137]: Leaving mDNS multicast group on interface eth0.IPv6 with address fe80::4694:fcff:fe6e:befa.
Feb 27 11:18:02 rn4220 avahi-daemon[23137]: Leaving mDNS multicast group on interface eth0.IPv4 with address 10.6.56.159.
Feb 27 11:18:02 rn4220 avahi-daemon[23137]: avahi-daemon 0.6.31 exiting.
Feb 27 11:18:02 rn4220 avahi-daemon[23156]: Process 23137 died: No such process; trying to remove PID file. (/var/run/avahi-daemon//pid)
Feb 27 11:18:02 rn4220 avahi-daemon[23156]: Found user 'avahi' (UID 84) and group 'avahi' (GID 84).
Feb 27 11:18:02 rn4220 avahi-daemon[23156]: Successfully dropped root privileges.
Feb 27 11:18:02 rn4220 avahi-daemon[23156]: avahi-daemon 0.6.31 starting up.
Feb 27 11:18:02 rn4220 avahi-daemon[23156]: WARNING: No NSS support for mDNS detected, consider installing nss-mdns!
Feb 27 11:18:02 rn4220 avahi-daemon[23156]: Successfully called chroot().
Feb 27 11:18:02 rn4220 avahi-daemon[23156]: Successfully dropped remaining capabilities.
Feb 27 11:18:02 rn4220 avahi-daemon[23156]: Loading service file /services/frontview.service.
Feb 27 11:18:02 rn4220 avahi-daemon[23156]: Loading service file /services/nut.service.
Feb 27 11:18:02 rn4220 avahi-daemon[23156]: Joining mDNS multicast group on interface eth0.IPv6 with address fe80::4694:fcff:fe6e:befa.
Feb 27 11:18:02 rn4220 avahi-daemon[23156]: New relevant interface eth0.IPv6 for mDNS.
Feb 27 11:18:02 rn4220 avahi-daemon[23156]: Joining mDNS multicast group on interface eth0.IPv4 with address 10.6.56.159.
Feb 27 11:18:02 rn4220 avahi-daemon[23156]: New relevant interface eth0.IPv4 for mDNS.
Feb 27 11:18:02 rn4220 avahi-daemon[23156]: Network interface enumeration completed.
Feb 27 11:18:02 rn4220 avahi-daemon[23156]: Registering new address record for fe80::4694:fcff:fe6e:befa on eth0.*.
Feb 27 11:18:02 rn4220 avahi-daemon[23156]: Registering new address record for 10.6.56.159 on eth0.IPv4.
Feb 27 11:18:03 rn4220 upnphttpd[23162]: /usr/sbin/upnphttpd is started
Feb 27 11:18:03 rn4220 avahi-daemon[23156]: Server startup complete. Host name is rn4220.local. Local service cookie is 2506841808.

Does anyone know what those error mean? How do I stop raidard from quitting on signal 15? How do I stop avahi-daemon to stop spamming to daemon.log?

Thank you in advance.