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Using soft constraints to select a specific Cloud Zone based upon performance tier
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Using soft constraints to select a specific Cloud Zone based upon performance tier

Using soft constraints to select a specific Cloud Zone based upon performance tier book Article ID: 377947 calendar_today Updated On:

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Using soft constraints to select a specific Cloud Zone based upon performance tier

book

Article ID: 377947

calendar_today

Updated On:

Products

VMware Aria Suite

Issue/Introduction

  • You is have have two or more Cloud Zones system are being provision to .
  • Each Cloud Zone is uniquely tagged with High, Medium, and Standard (or some variation of this combination)
  • All Cloud Zones have a priority affinity of 0.
  • When target the low – tier performance Cloud Zone using a soft constraint , the request is instead place on a high performance tier .

Environment

VMware Aria Automation 8.x

cause

 

  • soft constraints is allow allow the system to express a preference , which is honor only if the resource are available . However , soft constraint may not be apply if there are conflict project placement policy or if all zone have identical Priority Affinity value .
  • Specifically, using a project placement policy set to “SPREAD” will distribute workloads across all available zones, potentially overriding the intended behavior of soft constraints.

 

Resolution

To address this issue , there are two possible approach :

  1. Modify Cloud Zone Affinity with “SPREAD” Placement Policy:

    • If continue to use the ” spread ” policy , adjust the Priority Affinity setting of Cloud Zones :
      • For instance, set the following Priority Affinity:
      • If more tiers exist:
        • high :2
        • Medium: 1
        • Standard: 0
    • These affinity settings is ensure will ensure that when a soft constraint is used , the preferred Cloud Zone is select as intend , even while maintain workload distribution with ” spread . “

  2. change to the ” DEFAULT ” Project Placement Policy :

    • Switch the project placement policy to “DEFAULT”.
    • This approach respects soft constraints more directly, especially when Cloud Zones are set with the same Priority Affinity (0). This ensures that deployments prioritize the intended zone as indicated by the soft constraints without requiring changes to affinity values.

Additional Considerations:

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