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  1. OpenShift Container Platform (OCP) Strategy
  2. OCPSTRAT-1390

HCP KubeVirt VM Enhanced Topology Spread

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      Feature Overview (aka. Goal Summary)  

      Today VMs for a single nodepool can “clump” together on a single node after the infra cluster is updated. This is due to live migration shuffling around the VMs in ways that can result in VMs from the same nodepool being placed next to each other.

       

      Through a combination of TopologySpreadConstraints and the De-Scheduler, it should be possible to continually redistributed VMs in a nodepool (via live migration) when clumping occurs. This will provide stronger HA guarantees for nodepools

       

      Goals (aka. expected user outcomes)

      VMs within a nodepool should re-distribute via live migration in order to best satisfy topology spread constraints.

      Requirements (aka. Acceptance Criteria):

      A list of specific needs or objectives that a feature must deliver in order to be considered complete.  Be sure to include nonfunctional requirements such as security, reliability, performance, maintainability, scalability, usability, etc.  Initial completion during Refinement status.

      <enter general Feature acceptance here>

       

      Anyone reviewing this Feature needs to know which deployment configurations that the Feature will apply to (or not) once it's been completed.  Describe specific needs (or indicate N/A) for each of the following deployment scenarios. For specific configurations that are out-of-scope for a given release, ensure you provide the OCPSTRAT (for the future to be supported configuration) as well.

      Deployment considerations List applicable specific needs (N/A = not applicable)
      Self-managed, managed, or both  
      Classic (standalone cluster)  
      Hosted control planes  
      Multi node, Compact (three node), or Single node (SNO), or all  
      Connected / Restricted Network  
      Architectures, e.g. x86_x64, ARM (aarch64), IBM Power (ppc64le), and IBM Z (s390x)  
      Operator compatibility  
      Backport needed (list applicable versions)  
      UI need (e.g. OpenShift Console, dynamic plugin, OCM)  
      Other (please specify)  

      Use Cases (Optional):

      Include use case diagrams, main success scenarios, alternative flow scenarios.  Initial completion during Refinement status.

      <your text here>

      Questions to Answer (Optional):

      Include a list of refinement / architectural questions that may need to be answered before coding can begin.  Initial completion during Refinement status.

      <your text here>

      Out of Scope

      High-level list of items that are out of scope.  Initial completion during Refinement status.

      <your text here>

      Background

      Provide any additional context is needed to frame the feature.  Initial completion during Refinement status.

      <your text here>

      Customer Considerations

      Provide any additional customer-specific considerations that must be made when designing and delivering the Feature.  Initial completion during Refinement status.

      <your text here>

      Documentation Considerations

      Provide information that needs to be considered and planned so that documentation will meet customer needs.  If the feature extends existing functionality, provide a link to its current documentation. Initial completion during Refinement status.

      <your text here>

      Interoperability Considerations

      Which other projects, including ROSA/OSD/ARO, and versions in our portfolio does this feature impact?  What interoperability test scenarios should be factored by the layered products?  Initial completion during Refinement status.

      <your text here>

              rh_pelauter@redhat.com Peter Lauterbach
              rhn-engineering-dvossel David Vossel
              Catherine Tomasko Catherine Tomasko
              Senthamilarasu S Senthamilarasu S
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                Created:
                Updated: