IBM Power 780 Technical Overview And Introduction page 144

After you select the value of the memory expansion factor that you want to achieve, you can
use this value to configure the partition from the managed console (Figure 3-5).
Active Memory Expansion Modeled Statistics:
-----------------------
Modeled Expanded Memory Size :
Expansion True Memory
Factor Modeled Size
--------- --------------
1.21 6.75 GB
1.31 6.25 GB
1.41 5.75 GB
1.51 5.50 GB
1.61 5.00 GB
Active Memory Expansion Recommendation:
---------------------
The recommended AME configuration for this workload is to
configure the LPAR with a memory size of 5.50 GB and to configure
a memory expansion factor of 1.51.
expansion of 45% from the LPAR's current memory size.
configuration, the estimated CPU usage due to Active Memory
Expansion is approximately 0.58 physical processors, and the
estimated overall peak CPU resource required for the LPAR is 3.72
physical processors.
Figure 3-5 Using the planning tool result to configure the partition
On the HMC menu describing the partition, select the Active Memory Expansion check box
and enter the true and maximum memory, and the memory expansion factor. To turn off
expansion, clear the check box. In both cases, reboot the partition to activate the change.
In addition, a one-time, 60-day trial of Active Memory Expansion is available to provide more
exact memory expansion and CPU measurements. The trial can be requested by using the
Power Systems Capacity on Demand web page:
http://www.ibm.com/systems/power/hardware/cod/
Active Memory Expansion can be ordered with the initial order of the server or as a
miscellaneous equipment specification (MES) order. A software key is provided when the
enablement feature is ordered that is applied to the server. Rebooting is not required to
enable the physical server. The key is specific to an individual server and is permanent. It
cannot be moved to a separate server. This feature is ordered per server, independent of the
number of partitions using memory expansion.
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IBM Power 770 and 780 (9117-MMD, 9179-MHD) Technical Overview and Introduction
8.00 GB
Modeled Memory CPU Usage
Gain Estimate
----------------- -----------
1.25 GB [ 19%] 0.00
1.75 GB [ 28%] 0.20
2.25 GB [ 39%] 0.35
2.50 GB[ 45%] 0.58
3.00 GB [ 60%] 1.46
This will result in a memory
With this
5.5 true
8.0 max