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Accelerator for System i
Coinciding with the release of i5/OS V5R4, IBM introduces new entry IBM System i models. The
models introduce accelerator technologies and/or L3 cache in order to improve options for clients in the
low-end server space. As an overview, the Accelerator for System i affects two 520 Models: (1) 600
CPW with no L3 cache and (2) 1200 CPW with L3 cache. With the Accelerator for System i, the 600
CPW can be accelerated to a 3100 CPW system, whereas the 1200 CPW can be accelerated to 3800
CPW.
In order to showcase the abilities of these
systems, experiments were completed on
WAS 6.0 running Trade 6 to display the
benefits. The following information
describes the models in the context of both
capacity and response time. Results were
collected on System i Model 520 with
varying feature codes depending on the
presence of the Accelerator for System i.
With regards to capacity, Figure 6.5 shows
the 600 CPW model accelerated to 3100
CPW increases capacity 5.5 times.
Additionally, the 1200 CPW model
accelerated to 3800 CPW increases capacity
3 times. This provides an extraordinary
benefit when running WebSphere
Applications.
It is also important to note the benefits of
L3 cache. For example, the 1200 CPW
model has 2.5 times more capacity than that
of the 600 CPW system. Additionally, Java
workloads tend to perform better with L3
cache. Thus, besides the benefit of increased
capacity, a move from a system with no L3
cache to a system with L3 cache may scale better than CPW
ratings would indicate.
IBM i 6.1 Performance Capabilities Reference - January/April/October 2008
© Copyright IBM Corp. 2008 Chapter 6 - Web Server and WebSphere 103
Trade JDBC Throughput
0
50
100
150
200
250
300
350
500 600 1000 1200 2400 3100 3300 3800
CPW Rating
Transaction per second
Accelerator
New Models
Old Models
Figure 6.5 - Accelerator for System i
performance data - Capacity comparison
(WAS 6.0 running Trade 6).