On 7/4/2015 12:28 AM, Jatin Davey wrote: >> > My server supports ACPI 4.0 standard , Will that be helpful ? does `init 0` as a root command cause it to gracefully shut down and power off ? thats all the ACPI support you need. what brand/model UPS (battery backup) do you have ? the UPS software, apcupsd and/or NUT, needs to listen to the UPS to tell it when the power has failed, then it can tell your OS to shutdown after a suitable delay (if your UPS is good for 30 minutes, you might not want to shut down until the power has failed for 15 minutes, so brief outages don't cause a shutdown) -- john r pierce, recycling bits in santa cruz