Intel 170 Servers, 7xx Servers 14.1.4 571B, 5709, 573D, 5703, 2780 IOA Comparison Chart, Dasd

14.1.4 571B, 5709, 573D, 5703, 2780 IOA Comparison Chart

In the following two charts we are modeling a System i 520 with a 573D IOA using RAID5, comparing 3 70GB 15K RPM DASD to 4 70GB 15K RPM DASD. The 520 is capable of holding up to 8 DASD but many of our smaller customers do not need the storage. The charts try to point out that there may be performance considerations even when the space isn’t needed.

14.1.4.1

14.1.4.2

(sec)		573D 3 RAID5 DASD		573D 4 RAID5 DASD
Time	0.5
	0.4
Response
	0.3
	0.2
System	0.1
	0
	0	200	400	600	800
			Workload Throughput

(ms)		573D 3 RAID5 DASD		573D 4 RAID5 DASD
Time	40
	30
Response
	20
	10
DASD
	0
	0	100	200	300	400	500
			Ops/Sec

IBM i 6.1 Performance Capabilities Reference - January/April/October 2008
© Copyright IBM Corp. 2008	Chapter 14 DASD Performance	195