Specifications

5102ch02.fm Draft Document for Review May 12, 2014 12:46 pm
70 IBM Power System S822 Technical Overview and Introduction
IBM regularly updates the Virtual I/O Server code. To find information about the latest
updates, visit the Fix Central website:
http://www.ibm.com/support/fixcentral/
2.10.4 Java
There are unique considerations when running Java on POWER8 servers. For best use of the
performance capabilities and most recent improvements of POWER8 technology, upgrade
your JVM (or JDK) to IBM Java7 Release1 when possible, although IBM Java7, Java6, or
Java5 still are able to run on POWER8. See the AIX Download and service information page:
http://www.ibm.com/developerworks/java/jdk/aix/service.html
2.11 Energy management
The Power S822 system is designed with features to help clients become more energy
efficient. EnergyScale technology enables advanced energy management features to
dramatically and dynamically conserve power and further improve energy efficiency.
Intelligent Energy optimization capabilities enable the POWER8 processor to operate at a
higher frequency for increased performance and performance per watt, or dramatically
reduce frequency to save energy.
2.11.1 IBM EnergyScale technology
IBM EnergyScale technology provides functions to help the user understand and dynamically
optimize processor performance versus processor energy consumption, and system
workload, to control IBM Power Systems power and cooling usage.
EnergyScale uses power and thermal information that is collected from the system to
implement policies that can lead to better performance or better energy utilization. IBM
EnergyScale has the following features:
򐂰 Power trending
EnergyScale provides continuous collection of real-time server energy consumption. It
enables administrators to predict power consumption across their infrastructure and to
react to business and processing needs. For example, administrators can use such
information to predict data center energy consumption at various times of the day, week,
or month.
򐂰 Power saver mode
Power saver mode lowers the processor frequency and voltage on a fixed amount,
reducing the energy consumption of the system while still delivering predictable
performance. This percentage is predetermined to be within a safe operating limit and
is not user configurable. The server is designed for a fixed frequency drop of almost
50% down from nominal frequency (the actual value depends on the server type and
configuration).
Note: The Easy Tier functionality that comes with the eight bay storage backplane (#EJ0U)
requires VIOS 2.2.3.3 with interim fix IV56366 or later