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Active State: In geographic mirroring, pertaining to the configuration state of a mirror copy that indicates
geographic mirroring is being performed, if the IASP is online.
Workload Description
Synchronization: This workload is performed by starting the synchronization process on the source side
from an unsynchronized geographic mirrored IASP. The workload time is measured from the time
geographic mirroring is activated on the source side until the target side has completed synchronization.
Synchronization time is measured using the three resume priority levels of low, medium, and high.
Switchable IASPs using Geographic Mirroring:
• Active Switchover - The workload consists of bringing up a database workload on the IASP and
letting it run until the desired number of jobs are active on the system. Once the workload is
stabilized and the geographic mirror copy is synchronized the command is issued from the GUI
or the CHGCRGPRI command to change the primary owner of the geographic mirrored copy.
Switchover time is measured from the time the role change is issued from the GUI or the
CHGCRGPRI until the new primary systems IASP is available.
• Inactive Switchover- Once the geographic mirror copy is synchronized the switchover is issued
from the GUI or CHGCRGPRI command. Switchover time is measured from the time at which
the switchover command is issued until the new primary systems IASP is available.
• Partition – After the geographic mirror copy is synchronized and the active workload is stabilized
an option 22(force MSD) is issued on the panel. Switchover time is measured from the time the
MSD is forced on the source side until the source node reports a failed status. After the failed
status is reported the commands are issued to perform the switchover of the mirrored copy to a
production copy.
Active State: The workload used was a slightly modified CPW workload for iASP environments.
Initially a baseline without Geographic Mirroring is performed at 70% CPU utilization on a System/User
ASP. The baseline value is then compared to various environment to assess the overhead of Geographic
Mirroring.
IBM i 6.1 Performance Capabilities Reference - January/April/October 2008
© Copyright IBM Corp. 2008 Chapter 21 High Availability Performance 329