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  1. Migration Toolkit for Virtualization
  2. MTV-3848

[DOC] Warm storage offload migration

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      The core feature (Epic MTV-3710) supports scenarios where the source storage (e.g., a shared filesystem or NFS volume) is accessible by both the source virtualization platform and the target container host environment. Instead of streaming the data, the data transfer component "offloads" the storage volume, allowing the target VM to directly utilize the same underlying data, significantly reducing the final cutover time. This approach is similar to a storage vMotion operation.

      Technical Writer Scope

      The documentation required for this feature is extensive, as it is a new migration type. Key areas for the technical writer include:

      1. Conceptual Model: Clearly explain the "offload" data flow versus the standard streaming data flow. Use diagrams or simple descriptions to show how the storage volume itself moves or is re-mounted.
      1. Prerequisites: Document the highly specific storage requirements needed for this feature to work (e.g., shared storage connectivity, necessary RBAC for mounting, etc.).
      1. Migration Plan Setup: Detail how the user selects this migration method, likely through a flag or setting in the MigrationPlan CR or the web console.
      1. Downtime Analysis: Provide a comparison showing the expected downtime reduction versus a standard warm migration.

      This content could form the foundation of a new major section within the Migration Procedures chapter.

      JTBD Statement:

      "When I need to migrate large, critical Virtual Machines that are already running on storage accessible by both the source and target platforms, I want a method to 'offload' the storage volume instead of streaming all the data so that I can virtually eliminate the data cutover time and achieve a final migration with the absolute minimum possible business downtime."

      Documentation Task

      The documentation task (MTV-3848) supports this job by addressing the primary sub-job:

      "When I decide to use the Warm Storage Offload feature, I need a clear conceptual explanation and configuration guide so that I can confidently verify all shared storage prerequisites are met and safely enable the offload mechanism without risking data integrity."

              rhn-support-anarnold A Arnold
              rhn-support-anarnold A Arnold
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