A local power failure is a power failure that halts the computer
by affecting its central bus.
HP-UX Series 800 computers with Uninterruptible Power Systems
(UPS) recover from a local power failure in that whatever was running
on the system at the time of failure can resume executing when power
to the bus is restored. /usr/lbin/ups_mond
shuts down HP-UX when it detects a loss of AC power and /usr/sbin/power_onoff
informs ups_mond
when to shut down and turn on the system. See ups_mond(1M)
and power_onoff(1M) for details.
Remote power failures (affecting a remote bus) or device power
failures (affecting a device) do not necessarily affect the system
as a whole, unless the remote devices provide critical resources
for the system.
If you know power will go out soon, shut down the computer
and turn off the power.
If local power failure occurs, do not turn off the computer
or peripherals that contain vital system resources. Instead, turn
off all other equipment that is not protected
by power failure recovery software. An electrical surge just as
power is restored could seriously damage hardware that has been
left on. When power is fully restored, turn the equipment back on.
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