Intel AS/400 RISC Server, 170 Servers, 7xx Servers manual 14.1.4.4

The charts below are an attempt to allow the different IOAs available to be compared on a single chart. An I/O Intensive Workload was used for our throughput measurements. The system used was a 520 model with a single 5094 attached which contained the IOAs for the measurements.

Note: the 5709 and 573D are cache cards for the built in IOA in the 520/550/570 CECs, even though I show them in the following chart like they are the IOA. The 5709 had 8 - 15K 35GB DASD units and the 573D had 8 - 15K 70 GB DASD, the maximum DASD allowed on the built in IOAs.

The other IOAs used 10 - 15K 35GB DASD units. Again this is all for relative comparison purposes as the 571B only supports 10 DASD units in a 5094 enclosure and a maximum of 12 DASD units in a 5095 enclosure. The 2757 and 2780 can support up to 18 DASD units with the same performance characteristics as they display with the 10 DASD units, so when you are considering the right IOA for your environment remember to take into account your capacity needs along with this performance information.

14.1.4.3

		571B RAID-5 IOP		571B RAID-5 IOPLess
(sec)		571B RAID-6		5709 RAID-5
		573D RAID-5		5703 RAID-5
		2780 RAID-5
Time	0.4
	0.3
Response
	0.2
	0.1
	0
System	0	1000	2000	3000	4000	5000
		Workload Throughput

			571B RAID-5 IOP				571B RAID-5 IOPLess
			571B RAID-6				5709 RAID-5
	(ms)		573D RAID-5				5703 RAID-5
			2780 RAID-5
		50
	Time
		40
	Response
14.1.4.4		30
		20
		10
	DASD	0
		0	200	400	600	800	1000	1200	1400
					Ops/Sec
IBM i 6.1 Performance Capabilities Reference - January/April/October 2008

© Copyright IBM Corp. 2008 Chapter 14 DASD Performance 196