5709, 573D, 5703, 2780 Ioa Comparison Chart - IBM 170 Servers Manual

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
IBM i 6.1 Performance Capabilities Reference - January/April/October 2008
©
Copyright IBM Corp. 2008
573D 3 RAID5 DASD
0.5
0.4
0.3
0.2
0.1
0
0 200
573D 3 RAID5 DASD
40
30
20
10
0
0 100
Chapter 14 DASD Performance
573D 4 RAID5 DASD
400
Workload Throughput
573D 4 RAID5 DASD
200 300
Ops/Sec
600 800
400 500
195