Intel 170 Servers, 7xx Servers Sizing Domino on System, V5R3 Main Storage Options Response Times

During the tests, the *DYNAMIC and *MINIMIZE settings used up to 5% more CPU resource than *NORMAL.

Figure 11.5 below shows the response time data rather than fault rates for the same test shown in Figure 11.4 for the attributes *NORMAL, *DYNAMIC, and *MINIMIZE.

V5R3 Main Storage Options Response Times

(ms)	80
	70
TIME	60
RESPONSE	50
	40
	30
AVERAGE	20
	10
	0
	60775040	47026568	36388264	28156548	21787000

BASE POOL SIZE(KB)

V5R3 *DYNAMIC V5R3 *NORMAL V5R3 *MINIMIZE

Figure 11.5 V5R3 Main Storage Options - Response Times

Notice that there is not an exact correlation between fault rates and response times as shown in Figures

11.4and 11.5. The *NORMAL and *DYNAMIC option showed the lowest average response times at the left side of the chart where the most main storage was available. As main storage was constrained (moving to the right on the chart), *MINIMIZE provided lower response times.

As is the case with many performance settings, “your mileage will vary” for the use of *DYNAMIC and *MINIMIZE. Depending on the relationship between the CPU, disk and memory resources on a given system, use of the Main Storage Options may yield different results. As has already been mentioned, both *MINIMIZE and *DYNAMIC required up to 5% more CPU resource than *NORMAL. The test environment used to collect the results in Figures 11.4 and 11.5 had an adequate number of disk drives such that disk utilizations were below recommended levels for all tests.

11.12 Sizing Domino on System i

To compare Domino processing capabilities for System i servers that use POWER5 and earlier processors, you should use the MCU ratings provided in Appendix C . The ratings are based on the Mail and Calendaring User workload and provide a better means of comparison for Domino processing than do CPW ratings for these earlier models.

IBM i 6.1 Performance Capabilities Reference - January/April/October 2008
© Copyright IBM Corp. 2008	Chapter 11 - Domino	171