IBM Z9, Planning Manual

Page: 167 / 274

Example 2. Without Processor Resource Capping: In the following example:
v
Six physical CPs are online
v
No LPs are capped
v
All LPs have sufficient workload demand to use their shares
Table 3-4. PR/SM LPAR Processor Weight Management without Processor Resource Capping
LP
LCPs
Online Weight (1)
Weight per
LCP
LCP % of
PCP
3.6%
Share
3.6%
Total
Resulting
Weight Range
Resulting
Utilization
Range
A 6 500 83.3 50 3.0 – 80.3–86.3 48.2%–51.8%
B 3 300 100.0 60 3.6 – 96.4–103.6 28.9%–31.1%
C (2)
C (3)
3 200 66.7 40 2.4 –
12
64.3–69.1
54.7–78.7
19.3%–20.7%
16.4%–23.6%
Total Capacity of the
Shared PCP
Resources
1000 / 6 PCPs = 166.7 = PCP capacity
Legend:
LCP Logical CP
PCP Physical CP
Notes:
1. Use the Customize/Delete Activation Profiles task available from the CPC Operational Customization tasks list to
open a reset or image profile to set the processing weight for an LP. The Processing weight field is located on the
Processor page for the LP.
2. The logical CPs for LP C (2) fall outside the enforceable range because each logical CP’s share is only 40% of a
physical CP.
3. The LP’s range is bounded by the line shown for LP C (3). Typically, though, even this configuration will see
results comparable to the line for LP C (2).
Processing Weight Management Formulas: The following formulas were used
to compute the values in the previous two examples:
Weight per LPC =
LPCTL Weight
Number of LCPs online
LCP percent of PCP = x
LPCTL Weight
Total of LPCTL Weights
Number of PCPs online
Number of LCPs online
3.6 percent Share = Weight per LCP x 3.6 percent
3.6 percent Total =
Total Weight x 3.6 percent
Number of LCPs online
Resulting Utilization Range = Resulting Weight Range x
Number of LCPs online
Total Weight
or
Weight per LCP 3.6 percent Share
+-
Resulting Weight Range =
Weight per LCP 3.6 percent Total
+-
Resulting Weight Range =
Chapter 3. Determining the Characteristics of Logical Partitions
3-41