Intel 170 Servers, AS/400 RISC Server 14.3.2 57B8/57B7 IOA, 100 350 600 850 1100 1350 1600 1850

14.3.2 57B8/57B7 IOA

With the addition of the POWER6 520 and 550 systems comes the new 57B8/57B7 SAS Raid Ennoblement Controller with Auxiliary Write Cache. This controller is only available in the POWER6 520 and 550 systems and provides RAID5/6 capabilities, with 175MB redundant write cache. Below are some charts comparing the Storage Controllers for the POWER5 570 (573D), which can be either mirrored or RAID5 protected. The POWER6 570 (572C) which can only be mirrored, and the POWER6 520/550 (57B8/57B7) which can be RAID5/6 or protected with mirroring.

System Response Time (sec)

V5R4M5 9406 570 573D 6 DASD Mirrored (No Cache)

V6R1M0 9406 MMA 572C 6 DASD Mirrored (No Cache)

V6R1M0 9406 57B8 6 DASD Mirrored (Cache)

V6R1M0 9406 57B8 6 DASD RAID5 (Cache)

0.35
0.3
0.25
0.2
0.15
0.1
0.05
0
100	350	600	850	1100	1350	1600	1850

Workload Throughput

V5R4M5 9406 570 573D 6 DASD Mirrored (No Cache)

V6R1M0 9406 MMA 572C 6 DASD Mirrored (No Cache)

V6R1M0 9406 57B8 6 DASD Mirrored (Cache)

V6R1M0 9406 57B8 6 DASD RAID5 (Cache)

Time		40
		35
Response	(ms)	30
		25
		20
DASD		15
		10
		5
		0
		0	400	800	1,200	1,600
				Ops/Sec

IBM i 6.1 Performance Capabilities Reference - January/April/October 2008
© Copyright IBM Corp. 2008	Chapter 14 DASD Performance	210