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14.1.3 571B
iV5R4 offers two new options on DASD configuration.
y RAID6 which offers improved system protection on supported IOAs.
y NOTE: RAID6 is supported under iV5R3 but we have chosen to look at performance data on
a iV5R4 system.
y IOPLess operation on supported IOAs.
14.1.3.1 571B RAID5 vs RAID6 - 10 15K 35GB DASD
14.1.3.2 571B IOP vs IOPLESS - 10 15K 35GB DASD
The system CPU % used with and without and IOP was basically the same for the 571B with our
workload tests.
IBM i 6.1 Performance Capabilities Reference - January/April/October 2008
© Copyright IBM Corp. 2008 Chapter 14 DASD Performance 194
RAID-5 vs RAID-6 .
0
0.05
0.1
0.15
0.2
0.25
0 500 1000 1500 2000 2500 3000 3500
Workload Throughput
System Responce Time
(sec)
571B RAID-5 571B RAID-6
IOP vs IOPLess
0
0.05
0.1
0.15
0.2
0.25
0 500 1000 1500 2000 2500 3000 3500
Workload Throughput
System Responce Time
(sec)
571B RAID-5 IOP 571B RAID-5 IOPLess