Intel 7xx Servers, 170 Servers, AS/400 RISC Server manual Server Model Differences

2.3 Server Model Differences

Server models were designed for a client/server workload and to accommodate an interactive workload. When the interactive workload exceeds an interactive CPW threshold (the “knee of the curve”) the client/server processing performance of the system becomes increasingly impacted at an accelerating rate beyond the knee as interactive workload continues to build. Once the interactive workload reaches the maximum interactive CPW value, all the CPU cycles are being used and there is no capacity available for handling client/server tasks.

Custom server models interact with batch and interactive workloads similar to the server models but the degree of interaction and priority of workloads follows a different algorithm and hence the knee of the curve for workload interaction is at a different point which offers a much higher interactive workload capability compared to the standard server models.

For the server models the knee of the curve is approximately:

y100% of interactive CPW for:

yiSeries model 170s announced on or after 9/98

y7xx models

y6/7 (86%) of interactive CPW for: y AS/400e custom servers

y1/3 of interactive CPW for:

yAS/400 Advanced Servers

yAS/400e servers

yAS/400e model 150

yiSeries model 170s announced in 2/98

For the 7xx models the interactive capacity is a feature that can be sized and purchased like any other feature of the system (i.e. disk, memory, communication lines, etc.).

The following charts show the CPU distribution vs. interactive utilization for Custom Server and pre-2/99 Server models.

IBM i 6.1 Performance Capabilities Reference - January/April/October 2008
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