Using WLMTUNING=NO

Rules

If WLMTUNING=NO, the following rules apply when LPARs or groups have 4HRAs above entitlement:

• The LPAR or group with the highest priority is favored.
• If LPARs or groups have equal priority, the LPAR or group with the lowest ratio 4HRA/entitlement is favored.

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.

iCap can distribute the gray-space (unused) MSUs from GROUPGGG and LPARCCC to other LPARs and groups in need of additional MSUs. iCap calculates gray-space MSUs as follows:

Because the remaining LPARs and groups (LPARAAA, LPARBBB, and GROUPHHH) have 4HRAs above their entitlement, they must compete for the remaining 27 gray-space MSUs. iCap distributes the gray-space MSUs as follows:

• Of the three competitors, LPARAAA has the higher priority value (2). 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 priority value of 3, 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	100	75	1.33
  GROUPHHH	129	125	1.03

  Based on the following formula, iCap calculates that GROUPHHH is allowed to take 5 of the remaining 8 gray-space MSUs:

   (<remainingGraySpaceMSUs> × <entitlement>) ÷ <totalEntitlementForCompetingLPARsOrGroups>

  (8 × 125) ÷ (125  + 75) = 5

  However, GROUPHHH needs only 4 MSUs (GCL (129) - entitlement (125)), which leaves 4 gray-space MSUs still available.

• iCap distributes the 4 remaining gray-space MSUs to LPARBBB, but that is not enough to meet its 4HRA (100). Consequently, LPARBBB is soft-capped.

Recommendation

BMC recommends assigning a generous proportion value and a priority value of 1 to mission-critical LPARs and capacity groups:

• Awarding generous proportions to mission-critical LPARs and groups increases the possibility of the 4HRA remaining below entitlement. Consequently, the mission-critical LPARs and groups receive the MSUs that they require.
• In the event that the 4HRA exceeds the entitlement, having a priority value of 1 increases the probability that the mission-critical LPARs or groups will receive first choice of gray-space MSUs.