Power Saver Mode in POWER system can be used to reduce the power utilization of the physical machine by lowering the voltage and frequency by a fixed percentage(by aroudn 14-15%).
It is supported with 4GHz processor(and later) on Power6(and later) systems.
This is achieved by POWER processors using a low power mode known as Nap that stops processor execution when there is no work to do on the processor core.
You can enable or disable power save mode thru GUI or command line on the HMC.
Here are some commands.
1. To view the current Power Saver mode:
hscroot@hmc1:~> lspwrmgmt -m sys900 -r sys
name=sys900,type_model=8233-E8B,serial_num=0782C2R,curr_power_saver_mode=Enabled,desired_power_saver_mode=Enabled
2. To enable the Power Saver mode:
hscroot@hmc1:~> chpwrmgmt -m sys900 -r sys -o enable
3. To disable the Power Saver mode:
hscroot@hmc1:~> chpwrmgmt -m sys900 -r sys -o disable
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