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· Inactive switchover - The switching time is measured from the point at which the CHGCRGPRI
command is issued from the primary system which has no work until the IASP is available on the
new primary system.
· Partition - An active partition is created by starting the database workload on the IASP. Once the
workload is stabilized an option 22(force MSD) is issued on the panel. Switching time is
measured from the time the MSD is forced on the primary side until new primary node varies on
the IASP.
Workload Configuration
The wide variety of hardware configurations and software environments available make it
difficult to characterize a ‘typical’ high availability environment. The following section
provides a simple description of the high availability test environment used in our lab.
System Configuration
Cabling Map
HSL Line
870 Cluster HSL Cabling Map
System ASP
System ASP
iASP
Hardware Configuration
64 Gig64Gig
Memory
35 Gig35 Gig
Size of Dasd
27572757
Type of IOA's
15k15k
Speed of Dasd
5050
# of Arms in
System ASP
2200022000
CPW
24862486
Processor
74217421
Interactive Code
74217421
Feature code
870870
Model
System BSystem A
35 Gig
Size of Dasd
2757
Type of IOA's
15k
Speed of Dasd
180
# of Arms
iASP
IBM i 6.1 Performance Capabilities Reference - January/April/October 2008
© Copyright IBM Corp. 2008 Chapter 21 High Availability Performance 327