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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
14.1.8.1
14.1.8.2
IBM i 6.1 Performance Capabilities Reference - January/April/October 2008
© Copyright IBM Corp. 2008 Chapter 14 DASD Performance 201
571F/575B Scaling
0
0.05
0.1
0.15
0.2
0 5000 10000 15000 20000
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
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
Workload Throughput
System Response Time (sec)
571F/575B Scaling
0
5
10
15
20
25
30
0 1,000 2,000 3,000 4,000 5,000 6,000
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
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
Ops/Sec
DASD Response Time (ms)