Intel 170 Servers, AS/400 RISC Server, 7xx Servers Over a Standalone 12-way, 5920 26 %, 5700 21 %

The following chart shows projected LPAR capacities for several LPAR configurations. The projections are based on measurements on 1 and 2 way measurements when the system’s CPU was utilized at 70 percent capacity. The LPAR overhead was also factored into the projections. The system was at the V4R4M0 release level.

Table 18.4 Projected LPAR Capacities

LPAR Configuration		Projected LPAR CPW	Projected CPW Increase
Number	Processors		Over a Standalone 12-way
12	1-ways	5920	26 %
6	2-ways	5700	21 %

18.5 Summary

On a partitioned system the capacity increases will range from 5% to 26%. The capacity increase will depend on the number of processors partitioned and on the number of partitions. In general the greater the number of partitions the greater the capacity increase.

When consolidating systems, a reasonable and safe guideline is that a partition may have about 10% less capacity than an equivalent stand-alone system if all partitions will be running their peak loads concurrently. This cross-partition contention is significant enough that the system operator of a partitioned system should consider staggering peak workloads (such as batch windows) as much as possible.

IBM i 6.1 Performance Capabilities Reference - January/April/October 2008
© Copyright IBM Corp. 2008	Chapter 18 - LPAR	300