For info, the following is from ipmitool's man page, regarding power. using
the "soft" option on my server does appear to do a clean shutdown:
power
Performs a chassis control command to view and change the power state.
status
Show current chassis power status.
on
Power up chassis.
off
Power down chassis into soft off (S4/S5 state). WARNING: This
command does not initiate a clean shutdown of the operating system prior to
powering down the system.
cycle
Provides a power off interval of at least 1 second. No action
should occur if chassis power is in S4/S5 state, but it is recommended to
check power state first and only issue a power cycle command if the system
power is on or in lower sleep state than S4/S5.
reset
This command will perform a hard reset.
diag
Pulse a diagnostic interrupt (NMI) directly to the processor(s).
soft
Initiate a soft-shutdown of OS via ACPI. This can be done in a
number of ways, commonly by simulating an overtemperture or by simulating a
power button press. It is necessary for there to be Operating System support
for ACPI and some sort of daemon watching for events for this soft power to
work.
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