The nas take about 2 min to reboot, so I searched for a solution and I found that maybe some process don't shutdown correctly and so the system wait before kill it. So I found a page that explain a method, add some kernel boot parameters to debug the message and find whats wrong, if something is wrong.
But I don't have found any way to add those parameters, like systemd.log_level, I don't know what file I need to edit to do this debug.
Any suggestion?
J