Ioa - IBM 170 Servers Manual

14.3.3 572A IOA
The 572A IOA is a SAS IOA that is mainly used for SAS tape attachment but the 5886 EXP 12S
SAS Disk Drawer can also be attached.
Performance will be poor as the IOA does not have any cache.
The following charts help to show the performance characteristics that resulted during
experiments in the Rochester lab.
If storage space is all that is needed then the 5886 EXP 12S SAS Disk Drawer could be an
option
0.2
0.15
0.1
0.05
0
0
35
30
25
20
15
10
5
0
0
IBM i 6.1 Performance Capabilities Reference - January/April/October 2008
©
Copyright IBM Corp. 2008
9406 MMA 4 Way 571F w ith 24 RAID5 DASD in a 5786 EXP24 Disk Draw er
9406 MMA 4 Way 572A w ith 24 Mirrored DASD in 5886 EXP12S SAS Disk Draw ers
9406 p5 570 4 Way 2780 IOA 15 RAID5 DASD
2000 4000
DASD/IO Workload Throughput
9406 MMA 4 Way 571F w ith 24 RAID5 DASD in a 5786 EXP24 Disk Draw er
9406 MMA 4 Way 572A w ith 24 Mirrored DASD in 5886 EXP12S SAS Disk Draw ers
9406 p5 570 4 Way 2780 IOA 15 RAID5 DASD
500 1,000
Chapter 14 DASD Performance
6000 8000
1,500 2,000
Ops/sec
10000 12000
2,500 3,000
14000
3,500
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