Performance Measurements Were Done On Iv5R4 Systems. For Information On The Supported Features See The Ibm Product Announcement Letters - IBM 170 Servers Manual

14.1.5 Comparing Current 2780/574F with the new 571E/574F and 571F/575B NOTE:
iV5R3 has support for the features in this section but all of our performance measurements
were done on iV5R4 systems. For information on the supported features see the IBM
Product Announcement Letters.
A model 570 4 way system with 48 GB of mainstore memory was used for the following. In
comparing the new 571E/574F and 571F/575B with the current 2780/574F IOA, the larger read
and write cache available on the new IOA's can have a very positive effect on workloads.
Remember this workload is used to get a general comparison between new and current hardware
and cannot predict what will happen with all workloads.
Also note the 571E/574F requires the auxiliary cache card to turn on RAID and the 571F/575B
has the function included in its double-wide card packaging for better system protection.
Understanding of the general results are intended to help customers gauge what might happen in
their environments.
14.1.5.1
14.1.5.2
IBM i 6.1 Performance Capabilities Reference - January/April/October 2008
©
Copyright IBM Corp. 2008
2780/571E/571F 15 DASD RAID5
2780/574F (15 DASD): IOP, RAID-5
571E/574F (15 DASD): IOPLess, RAID-5
571F/575B (15 DASD): IOPLess, RAID-5
0.2
0.15
0.1
0.05
0
0 2500
Workload Throughput
2780/571E/571F 15 DASD RAID5
2780/574F (15 DASD): IOP, RAID-5
571E/574F (15 DASD): IOPLess, RAID-5
571F/575B (15 DASD): IOPLess, RAID-5
40
30
20
10
0
0 1,000
Chapter 14 DASD Performance
5000 7500
2,000 3,000
Ops/Sec
10000
4,000
197