Intel AS/400 RISC Server, 170 Servers, 7xx Servers manual Average Dasd Response Time Seconds

The following chart shows two IBM i operating system partitions using 14GB of memory and

1.7processors each served by 1 VIOS partition using 2GB of memory and .6 processors. The Commercial Performance Workload was running the same amount of transactions on each of the partitions for the same time intervals. Although there is an observed cost for VIOS to manage multiple partitions, VIOS was able to balance services to the two partitions. Experimenting with the number of processors and memory assigned to the partitions might yield a better environment for other workloads.

		VIOS/IBM i operation system, JS22, 2 Partition Experiments
		Commercial Performance Workload
Time (Seconds)	0.2001
Response	0.1001
	0.0001
	0	10000	20000	30000	40000	50000	60000
				Transactions/Minute
	1 of 2 i5/OS 1.7 Processor Partitions on a .6 Processor VIOS Partition Using 48 DS4800 DDMs
	2 of 2 i5/OS 1.7 Processor Partitions on a .6 Processor VIOS Partition Using 48 DS4800 DDMs
	1 Single i5?OS Partition 3.5 Processors on a .5 Processor VIOS Partition Using 96 4800 DDMs

			VIOS/IBM i operation system, JS22, 2 Partition Experiments
						Commercial Performance Workload
Average DASD Response	Time (Seconds)	0.031
		0.021
		0.011
		0.001
		0	500	1000	1500	2000	2500	3000	3500	4000	4500	5000	5500	6000	6500	7000	7500	8000	8500	9000
										ASP Throughput OP/S
		1 of 2 i5/OS 1.7 Processor Partitions on a .6 Processor VIOS Partition Using 48 DS4800 DDMs
		2 of 2 i5/OS 1.7 Processor Partitions on a .6 Processor VIOS Partition Using 48 DS4800 DDMs
		1 Single i5?OS Partition 3.5 Processors on a .5 Processor VIOS Partition Using 96 4800 DDMs
IBM i 6.1 Performance Capabilities Reference - January/April/October 2008

© Copyright IBM Corp. 2008 Chapter 14 DASD Performance 226