Using WLMTUNING=COMBINED

For this scenario, assume that the following conditions exist in your environment:

  • The workloads are governed by different WLM policies.
  • The WLM policies managing the workloads are sufficiently similar. That is, an importance value of n must be comparable on each sysplex.

Related topic

Entitlement-scenarios

Also, assume that you want to set the order in which LPARs and groups receive MSUs based on:

  • Adjusted Low-Importance Workload Percentage
  • Ratio (4HRA ÷ entitlement)

Rules

If WLMTUNING=COMBINED, the following rules apply when LPARs or groups have a 4HRA above entitlement

  • The LPAR or group with the lowest Adjusted Low-Importance Workload Percentage is favored.
  • If LPARs or groups have equal Adjusted Low-Importance Workload Percentage, the LPAR or group with the lowest ratio of 4HRA/entitlement is favored.

Important

If you are using WLMTUNING=COMBINED, you can also set Dynamic Entitlement=Y. When you enable Dynamic Entitlement, LPARs and groups with high-importance workloads are favored when the combined 4HRA exceeds 95% of MSU limit.

This parameter enables iCap to assign additional MSUs to LPARs and groups that are running high-importance workloads by taking MSUs from LPARs and groups with a large number of low-importance workloads.


Calculating the Adjusted Low-Importance Workload Percentage

iCap calculates the Adjusted-Low Importance Workload Percentage as follows:

<lowImportanceWorkloadPercentage> × <adjustmentFactor>

adjustmentFactor refers to the values that you set for the Adjustment Factors for Priority parameter. TheadjustmentFactor value corresponds to priority. The higher the priority is, the lower the adjustment factor is. That is, for two LPARs with an equal Low-Importance Workload Percentage, the LPAR with the highest priority (and lower adjustment factor) will have lower Adjusted Low-Importance Workload Percentage.lowImportanceWorkloadPercentage refers to a value that iCap calculates as follows:

 [<%OfStandardCPCConsumption> × <adjustmentFactor>] ÷ <consumptionOfAllWorkloads>

Important

You can specify the level of importance values that are considered to be of low importance with the Low Importance parameter. The default value is 5.

For more information about the Low Importance parameter, see Policy-level-and-subpolicy-level-parameters

Scenario

As the following view shows, both GROUPGGG and LPARCCC have 4HRAs that are below their entitlement values. Therefore, GROUPGGG and LPARCCC receive the MSUs to which they are entitled, and their DC or GCL is set slightly above the 4HRA. In contrast, LPARAAA, LPARBBB, and GROUPHHH have 4HRAs above their entitlements and must compete for the remaining 27 gray-space MSUs from GROUPGGG and LPARCCC. For an explanation of how to calculate gray-space MSUs, see Using-WLMTUNING-NO.

GUID-A895F40B-8F5F-422B-ABA4-9B71D14A7D94-low.png

iCap distributes the gray-space MSUs as follows:

  • LPARAAA has an Adjusted Low Importance Workload Percentage of 9 (the lowest of the remaining LPARs and groups).

    Important

    The Low-Importance Workload Percentage for LPARAAA is 11, the highest among the remaining LPARs and groups. Due to LPARAAA's priority value of 2 (and lower Adjustment Factor for its priority), its Adjusted Low-Importance Workload Percentage is the lowest, as shown in the Adj Low-Imp Wkld% column in the above figure.

    iCap determines that LPARAAA requires 19 of the gray-space MSUs:

    119 (4HRA) - 100 (entitlement) = 19

    This distribution leaves 8 remaining gray-space MSUs:

    27 (available gray-space MSUs) - 19 (MSUs required by LPARAAA) = 8

  • LPARBBB and GROUPHHH have an equal Adjusted Low-Importance Workload Percentage of 10, so iCap will distribute the remaining gray-space MSUs based on entitlement (or proportion). Because GROUPHHH has the lowest ratio of 4HRA/entitlement (as shown in the following table), GROUPHHH will receive the next distribution:

    LPAR or group

    4HRA

    Entitlement

    Ratio 4HRA/entitlement

    LPARBBB:

    83

    75

    1.11

    GROUPHHH:

    135

    125

    1.08

    • iCap calculates that GROUPHHH is allowed to take the remaining 8 gray-space MSUs. However, GROUPHHH does not receive enough MSUs to meet the 4HRA (135). Consequently, GROUPHHH is soft-capped.
    • As there are no remaining gray-space MSUs, iCap sets the DC of LPARBBB to 75 (equal to entitlement). Consequently, LPARBBB is also soft-capped.

 

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