Intel AS/400 RISC Server, 170 Servers, 7xx Servers manual Accelerator for System

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
					Trade JDBC Throughput				WAS 6.0 running Trade 6 to display the
									benefits. The following information
		350							describes the models in the context of both
									capacity and response time. Results were
		300							collected on System i Model 520 with
									varying feature codes depending on the
		250							presence of the Accelerator for System i.
	second								With regards to capacity, Figure 6.5 shows
		200							the 600 CPW model accelerated to 3100
	per							Accelerator	CPW increases capacity 5.5 times.
								New Models	Additionally, the 1200 CPW model
	Transaction
		150						Old Models	accelerated to 3800 CPW increases capacity
									3 times. This provides an extraordinary
		100							benefit when running WebSphere
		50							Applications.
									It is also important to note the benefits of
		0							L3 cache. For example, the 1200 CPW
									model has 2.5 times more capacity than that
		500	600	1000 1200 2400 3100 3300 3800
									of the 600 CPW system. Additionally, Java
						CPW Rating
									workloads tend to perform better with L3
									cache. Thus, besides the benefit of increased
									capacity, a move from a system with no L3
Figure 6.5 - Accelerator for System i							cache to a system with L3 cache may scale better than CPW
performance data - Capacity comparison							ratings would indicate.
(WAS 6.0 running Trade 6).

IBM i 6.1 Performance Capabilities Reference - January/April/October 2008
© Copyright IBM Corp. 2008	Chapter 6 - Web Server and WebSphere	103