IBM 170 Servers Manual page 211

The POWER6 520 and 550 also have an external SAS port, that is controlled by the 57B8/57B7,
used to connect a single #5886 - EXP 12S SAS Disk Drawer which can contain up to 12 SAS
DASD. Below is a chart showing the addition of the #5886 - EXP 12S SAS Disk Drawer.
POWER6 520 57B8/57B7 6 RAID5 DASD in CEC 12 RAID5 DASD in EXP 12S SAS Disk Drawer
POWER6 520 57B8/57B7 6 RAID5 DASD in CEC
0.25
0.2
0.15
0.1
0.05
0
0 500
POWER6 520 57B8/57B7 6 RAID5 DASD in CEC 12 RAID5 DASD in EXP 12S SAS Disk Drawer
POWER6 520 57B8/57B7 6 RAID5 DASD in CEC
10
8
6
4
2
0
0
IBM i 6.1 Performance Capabilities Reference - January/April/October 2008
©
Copyright IBM Corp. 2008
1000 1500 2000
Workload Throughput
1,000
Chapter 14 DASD Performance
2500 3000 3500
2,000
Ops/Sec
4000 4500 5000
3,000
211