Intel 170 Servers, AS/400 RISC Server, 7xx Servers Performance Limits on the 571F/575B, 14.1.8.1

14.1.8 Performance Limits on the 571F/575B

In the following charts we try to characterize the 571F/575B in different DASD configuration. The 15 DASD experiment is used to give a comparison point with DASD experiments from chart 14.1.5.1 and 14.1.5.2. The 18, 24 and 36 DASD configurations are used to help in the discussion of performance vs capacity.

Our DASD IO workload scaled well from 15 DASD to 36 DASD on a single 571F/575B

			571F/575B Scaling
		571F/575B (15 DASD): IOPLess, RAID-5
	(sec)	571F/575B (1 IOA 18 DASD 3 cages each off 1 571F port): IOPLess, RAID-5
14.1.8.1		571F/575B (24 DASD): IOPLess, RAID-5
		571F/575B (36 DASD 1 IOA 12 DASD off each 571F port): IOPLess, RAID-5
		571F/575B (36 DASD 2 IOAs 6 DASD off each 571F port): IOPLess, RAID-5
	Time
		0.2
	Response	0.15
		0.1
	System	0.05
		0
		0	5000	10000	15000	20000
			Workload Throughput
14.1.8.2			571F/575B Scaling

571F/575B (15 DASD): IOPLess, RAID-5

571F/575B (1 IOA 18 DASD 3 cages each off 1 571F port): IOPLess, RAID-5

571F/575B (24 DASD): IOPLess, RAID-5

(ms)	571F/575B (36 DASD 1 IOA 12 DASD off each 571F port): IOPLess, RAID-5
Time	571F/575B (36 DASD 2 IOAs 6 DASD off each 571F port): IOPLess, RAID-5
	30
Response	25
	10
	20
DASD	15
	0
	5
	0	1,000	2,000	3,000	4,000	5,000	6,000
				Ops/Sec

IBM i 6.1 Performance Capabilities Reference - January/April/October 2008
© Copyright IBM Corp. 2008	Chapter 14 DASD Performance	201