smartmontools problem


my version is 10.3, I have installed smartmontools, in the manual it shows:
To include drive health information in your daily status reports,

add a line like the following to /etc/periodic.conf:

    daily_status_smart_devices="/dev/ad0 /dev/da0"
But I didn't find /etc/periodic.conf file, what should I do to make it work?
So I just need copy /etc/defaults/periodic.conf to /etc/, and add daily_status_smart_devices="/dev/ad0 /dev/da0"
Where can I find the disk status logs?
Do not edit or copy the defaults files. They are read, then any additional settings made by the user are added (from a new /etc/periodic.conf, in this case), then the result is executed.
Yes, I just use touch /etc/periodic.conf and add
daily_status_smart_devices="/dev/ada0 /dev/ada1"
to the file.
Then I add
in rc.conf
But now
/etc/rc: WARNING: /usr/local/etc/smartd.conf is not readable.
log "message", what should I do?
What should I change smartd.conf? Now I just left it default settings, but no smart logs in messages.
It's slightly hidden and easily overlooked but the bottom of smartd.conf:
# If the test string DEVICESCAN is the first uncommented text
# then smartd will scan for devices /dev/hd[a-l] and /dev/sd[a-z]
# DEVICESCAN may be followed by any desired Directives.
FreeBSD uses a different naming convention, so DEVICESCAN will never find any drives.
You need to name the devices on your machine. no automatic mechs available.
So if you have one device ada0 with two partitions ada0p1/ada0p2 than write e.g. this into the conf:

/dev/ada0 -m -M test
On one of our machine we have just this line (email address redacted):
DEVICESCAN -a -o on -S on -n standby,q -s (S/../.././02|L/../../6/03) -W 4,50,50 -m

-a (monitor all attributes)
-o on (enable automatic online data collection)
-S on (enable automatic attribute autosave)
-n standby,q (do not check if disk is in standby, and suppress log message to that effect so as not to cause a write to disk)
-s ... (schedule short and long self-tests)
-W ... (monitor temperature)
-m ... (mail alerts)

It works fine for us.