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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:
- 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
- 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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