On Tue, Oct 08, 2024 at 12:00:33PM +0000, bugzilla-daemon@xxxxxxxxxx wrote: > It's an emergency shutdown in embedded scenario, we have capacitors that are > able to sustain the system for 1 second in case of unexpected power loss. It's > plenty of time to shutdown filesystems and drives properly. But we simply > cannot afford to wait for userspace. Works nicely so far. "so far" seems to mean "data loss" so I doubt that :) > > Yes, that is because you are shutting down things in the proper order, > like a normal shutdown will do. > > Is there a reason for sysrq shutdown not to do that? I mean... c'mon... > shutting down SSDs cleanly is the bare minimum we should do... if we fail to do > that, we can as well just unplug the power without trying to unmount or sync > anything... Because the sysrq code does NOT go through the normal device shutdown process, you are circumventing it, because it is only for emergencies. Don't rely on it for a normal shutdown, as that is not what it is designed for at all. good luck! greg k-h
