Also, kiosk machines generally just run apps and open files, so you don't have work that needs to be saved to disk. The setting to power on automatically is quite reliable in my experience, so you should only need that to recover from 95% or more of the power failure events you have. If you don't have an actual UPS - I would get an internet enabled power switch like WeMo or other or just train staff to power cycle the hardware. The NVRAM setting to power on when power returns has nothing to do with the shutdown command, so I wouldn't worry about the shutdown options and instead focus on the NVRAM settings for what to do when the machine senses a return of power.
Therefore, the autostart on power failure setting doesn't trigger, and I have to manually push the power button to make them boot again.
2018 word for mac 15.39 recover after power failure pro#
On both Macs I tested it with (Mac Mini with 10.10 and a Mac Pro on 10.11), the machines still power off immediately, they do not wait for five minutes in the halt state, so that I don't have the time to power off the mains. OS X uses this mode automatically with supported UPSs in emergency shutdowns.īut shutdown -hu now does not work. This simulates a dirty shutdown to permit a later automatic power on. u: The system is halted up until the point of removing system power, but waits before removing power for 5 minutes so that an external UPS (uninterruptible power supply) can forcibly remove power. According to the shutdown man page, the -u parameter seems to be what I need: I thought it might be possible to use the "Start up automatically after a power failure" in the energy system settings for this, along with the -u parameter to the shutdown command, in order to safely bring the machine in a state where I don't have to fear data loss. I want to have a Mac Mini automatically boot when power is applied, as I cannot conveniently reach its power button, because it resides inside an art installation, where the power will be shut down during the night.
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