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LCS Defines “Expendable MSUs

LPAR Capacity and Software Usage Analysis (LCS) Software introduces the concept of Expendable MSUs. The site may specify through a parameter which WLM Importance settings should be considered as expendable. A setting of “Expendable=6” can be used to specify that only the Discretionary Service Classes should be treated as Expendable. “Expendable=4” specifies that importance 4, importance 5 and discretionary work should be treated as Expendable.

Maximum Simultaneous 4HRA MSUs Based on RMF Intervals Beginning of Interval Interval MSUs (Not 4HRA) Expendable MSUs in This RMF Interval
210 Thu, 13Mar2003:15:45 205 93.8
210 Thu, 13Mar2003:16:00 200 74.0
209 Thu, 13Mar2003:15:30 207 96.3
209 Fri, 14Mar2003:13:45 209 22.2
209 Fri, 14Mar2003:14:00 209 16.3
209 Fri, 14Mar2003:13:15 209 53.4

Two important observations can be made from the table above:

  1. The Maximum Simultaneous 4 Hour Rolling Average is not a short spike for this workload, but rather once it is reached that level of usage is stable for 45 minutes or more
  2. For this workload, there are a significant number of "expendable" MSUs that could be deferred if the site chose to set a defined capacity

The LCS Defined Capacity Planning Spreadsheet can be used to study the effect of setting various Defined Capacities. Based on historical data the spreadsheet provides insight to the delay imposed on the expendable workloads, if a defined capacity was set and softcapping was required.

Last Updated: Thursday, 10 November, 2005

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