Intel 170 Servers Interval end time hour and minute, Number of interactive transactions per hour

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Component Report Component Interval Activity Data collected 190396 at 1030

Member . . . : Q960791030				Model/Serial . : 310-2043/10-0751D Main St...
Library. . : PFR			System name. . : TEST01			Version/Re..
	ITV		Tns/hr	Rsp/Tns	CPU %		CPU%	CPU %	Disk I/O	Disk I/O
	End				Total		Inter	Batch	per sec	per sec
									Sync	Async
	10:36		6,164	0.8	85.2		32.2	46.3	102.9	39
	10:41		7,404	0.9	91.3		45.2	39.5	103.3	33.9
	10:46		5,466	0.7	97.6		38.8	51	96.6	33.2
	10:51		5,622	1.2	97.9		35.6	57.4	86.6	49
	10:56		4,527	0.8	97.9		16.5	77.4	64.2	40.7
	:
	11:51		5,068	1.8	99.9		74.2	25.7	56.5	19.9
	11:56		5,991	2.4	99.9		46.8	45.5	65.5	32.6
Itv End------		Interval end time (hour and minute)
Tns/hr-------		Number of interactive transactions per hour
Rsp/Tns-----		Average interactive transaction response time

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(Calculate the average of the CPU utilization under the "Inter" heading for the desired time interval for interactive CPU utilization - "P" in the formula shown below.)

It is possible to have interactive jobs that do not show up with type "INT" in Collection Services or the Component Report. An example is a job that is submitted as a batch job that acquires a work station. These jobs should be included in the interactive CPU utilization count.

Most systems have peak workload environments. Care must be taken to ensure that peaks can be contained in server model environments. Some environments could have peak workloads that exceed the interactive capacity of a server model or could cause unacceptable response times and throughput.

In the following equations, let the interactive CPU utilization of the existing traditional system be represented by percent P. A server model that should then produce the same response time and throughput would have a CPW of:

Server Interactive CPW = 3 * P * Traditional CPW
or for Custom Models use:
Server Interactive CPW = 1.0 * P * Traditional CPW	(when P < 85%)
or
Server interactive CPW = 1.5 * P * Traditional CPW	(when P >= 85%)

Use the 1.5 factor to ensure the custom server is sized less than 85% CPU utilization.

These equations provide the server interactive CPU cycles required to keep the interactive utilization at or below the knee of the curve, with the current interactive workload. The equations given at the end of the Server and Custom Server Model Behavior section can be used to determine the effective interactive utilization above the knee of the curve. The interactive workload below the knee of the curve represents

IBM i 6.1 Performance Capabilities Reference - January/April/October 2008
© Copyright IBM Corp. 2008	Chapter 2 - Server Performance Behavior	33