Intel 7xx Servers, 170 Servers, AS/400 RISC Server manual Migration from Traditional Models

2.11 Migration from Traditional Models

This section describes a suggested methodology to determine which server model is appropriate to contain the interactive workload of a traditional model when a migration of a workload is occurring. It is assumed that the server model will have both interactive and client/server workloads.

To get the same performance and response time, from a CPU perspective, the interactive CPU utilization of the current traditional model must be known. Traditional CPU utilization can be determined in a number of ways. One way is to sum up the CPU utilization for interactive jobs shown on the Work with Active Jobs (WRKACTJOB) command.

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Work with Active Jobs

CPU %: 33.0		Elapsed time: 00:00:00				Active jobs:	152
Type	options, press Enter.
2=Change		3=Hold	4=End	5=Work with		6=Release 7=Display message
8=Work with spooled files				13=Disconnect ...
Opt	Subsystem/Job		User	Type	CPU %	Function	Status
__	BATCH		QSYS	SBS	0		DEQW
__	QCMN		QSYS	SBS	0		DEQW
__	QCTL		QSYS	SBS	0	PGM-QEZSCNEP	DEQW
__	QSYSSCD		QPGMR	BCH	0		EVTW
__	QINTER		QSYS	SBS	0	PGM-BUPMENUNE	DEQW
__	DSP05		TESTER	INT	0.2		DSPW
__	QPADEV0021		TEST01	INT	0.7	CMD-WRKACTJOB	RUN
__	QSERVER		QSYS	SBS	0		DEQW
__	QPWFSERVSD		QUSER	BCH	0		SELW
__	QPWFSERVS0		QUSER	PJ	0		DEQW

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(Calculate the average of the CPU utilization for all job types "INT" for the desired time interval for interactive CPU utilization - "P" in the formula shown below.)

Another method is to run Collection Services during selected time periods and review the first page of the Performance Tools for iSeries licensed program Component Report. The following is an example of this section of the report:

IBM i 6.1 Performance Capabilities Reference - January/April/October 2008
© Copyright IBM Corp. 2008	Chapter 2 - Server Performance Behavior	32