What you need to be able to do is an fsck periodically on the Raid itself as it was that that failed as per your image in post 15, hence that's why the system went into emergency mode.
What you could try is set up a scheduled job weekly after hours and enter the command fsck /dev/md0 (if your raid is set as md0) save it, select it, then click run, this will at least confirm that it will work, then send the output to email.
Mmm...the procedure is not simple for me, and I want to avoid errors...
First of all I have to unmount /dev/md0, and I cannot do it by GUI ( grey button ) neither by shell...Also, if I want to add the command by GUI, I think I have to add a line ( ; separated) like this:
umount /dev/md0; fsck /dev/md0; mount /dev/md0
Is It possible that I cannot umount because I have the SMB share active?