Memory Throughput - IBM Power Systems E870 Technical Overview And Introduction

Draft Document for Review October 14, 2014 10:19 am
On Figure 2-15 on page 55 there is an example of the minimum required activations for a
system with 1 TB of installed memory.
Installed memory
Minimum Static active
Maximum Mobile active
Figure 2-15 Example of the minimum required activations for a system with 1 TB of installed memory
The granularity for static memory activation is 1 GB, while for mobile memory activation the
granularity is 100 GB. On Table 2-9 there is a list of the feature codes that can be used to
achieve the desired number of activations:
Table 2-9 Static and mobile memory activation feature codes
Feature code
EMA5
EMA6
EMA9
Static memory activations can be converted to mobile memory activations after system
installation. In order to enable mobile memory activations, the systems must be part of a
power enterprise pool and have feature code #EB35 configured. For more information on
power enterprise pools, please see 2.4.2, "Power enterprise pools and mobile capacity on
demand (Mobile CUoD)" on page 62.

2.3.4 Memory throughput

The peak memory and I/O bandwidths per system node have increased over 300% compared
to previous POWER7 servers, providing the next generation of data intensive applications
with a platform capable of handling the needed amount of data.
Power E870
Table 2-10 shows the maximum bandwidth estimates for a single core on the Power E870
system.
Minimum active
256 GB
Feature description
1 GB Memory activation
100 GB Memory activation
100 GB Mobile memory activation
1024 GB
Without Power Enterprise Pools
512 GB 50% of total memory
With Power Enterprise Pools
25% of installed memory
768 GB
Amount of memory
1 GB
100 GB
100 GB
Chapter 2. Architecture and technical overview
5137ch02.fm
75% of installed memory
Type of activation
Static
Static
Mobile
55