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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
IBM i 6.1 Performance Capabilities Reference - January/April/October 2008
© Copyright IBM Corp. 2008 Chapter 14 DASD Performance 212
0
0.05
0.1
0.15
0.2
0 2000 4000 6000 8000 10000 12000 14000
DASD/IO Workload Throughput
System Response Time (ms)
9406 MMA 4 Way 571F with 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 Drawers
9406 p5 570 4 Way 2780 IOA 15 RAID5 DASD
0
5
10
15
20
25
30
35
0 500 1,000 1,500 2,000 2,500 3,000 3,500
Ops/sec
Dasd Response
Time (ms)
9406 MMA 4 Way 571F with 24 RAID5 DASD in a 5786 EXP24 Disk Drawer
9406 MMA 4 Way 572A with 24 Mirrored DASD in 5886 EXP12S SAS Disk Draw ers
9406 p5 570 4 Way 2780 IOA 15 RAID5 DASD