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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 Chapter 14 DASD Performance 195
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0.5
0 200 400 600 800
573D 3 RAID5 DASD 573D 4 RAID5 DASD
Workload Throughput
System Response Time (sec)
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0 100 200 300 400 500
573D 3 RAID5 DASD 573D 4 RAID5 DASD
Ops/Sec
DASD Response Time (ms)