Notes
Outline
LEA Section 7, Chapter 2:
The driver of Sharing
Sharing by mission workload
In addition to business process analysis, the other important component of enterprise architecture is the workload analysis.
Logical architecture is design based on the business process analysis.
Physical architecture is designed based on workload analysis.
For example : A sophisticate application system can be developed on a simple testing platform. But it must be deployed on an enterprise platform to support the workload. The physical architecture is not a function of business processes.
Physical architecture varies significantly to support the workload.
The definition of mission workload
The  work load is defined as mission workload instead of system workload.
Time is the major factor of workload.
Workload does not only consider the workload distribution but also the business performance requirements.
Engineering design based on peak load and peak time.
Distinguish mission and system workload
In technology oriented IT community, workload refers to system workload rather than mission workload.
System workload is considered as the operational characteristics for performance tuning.
EA consider workload as the mission workload rather system workload.
Mission workload is business oriented with regarding to the number of customers and where they are distribute and what time do they need the system.
The context of mission workload
Enterprise mission consist not only the mission function but also the mission workload.
Strategic planning support the mission.
People and business process follow the strategic planning leverage on social science, industrial technologies and information technologies.
Workload determine Physical architecture
In addition to business process analysis, the other important component of enterprise architecture is the workload analysis.
Logical architecture is design based on the business process analysis.
Physical architecture is designed based on workload analysis.
For example : A sophisticate application system can be developed on a simple testing platform. But it must be deployed on an enterprise platform to support the workload. The physical architecture is not a function of business processes.
Physical architecture varies significantly to support the workload.
Workload is fundamental of engineering
In the industrial age, workload and performance analysis has been the engineering fundamental such mechanical design, civil engineering.
Business processes has become the major concern in the information to automate business processes.
Business processes are an additional engineering driver.
Workload is still the engineering fundamental and it is critical for engineering of sharing.
EA has overlooked workload analysis
EA has been business process centric and overlooked  workload analysis.
Systems are design only with function consideration.
 Workload is only considered as operational characteristic rather the engineering design driver.
 Major system failure due to lack of workload consideration.
One size does not fit all
Platform independent technology does not eliminate the consideration of workload.
One size does not fit all even in the world of platform independent software engineering environment.
The complexity of software architecture varies significantly under different workload and performance requirements.
For example : a small engine and large engine. The function is the same but the design of large engine is much more complicate.
The complexity of software architecture is a function of workload and performance requirement.
LEA bring attention to workload
LEA bring attention to the engineering fundamental of workload analysis.
Workload analysis is the driver for the engineering of sharing.
The business function drive the logical architecture the workload and performance requirement drive the physical architecture.
Workload analysis and performance requirement is essential in enterprise architecture.
The holistic workload approach
In stove pipe culture, workload is estimated by each system development and contribute to significant idle resources.
In enterprise architecture, mission workload must be analyzed holistically to eliminate redundant workload calculation.
The workload is estimated base on the customer demographics, workload distribution and performance requirements.
Engineering of sharing such as IT resources consolidation must be designed based holistic mission workload and performance requirement.
The waste  in stove pipe culture