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Priyanka Middha
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Refine best practices for VM conversion in geographically distributed environments
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WindowsServerDocs/manage/windows-admin-center/use/migrate-vmware-to-hyper-v.md

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@@ -248,43 +248,9 @@ Complete the following steps to migrate VMware virtual machines to Hyper-V in Wi
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## Optimize VM Conversion for Geographically Distributed Environments
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The current Windows Admin Center (WAC) VM conversion workflow uses a centralized data-flow architecture.
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While this works well for single-site deployments, it can introduce performance limitations in geographically distributed environments.
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### Current Data Flow Architecture
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During VMware-to-Hyper-V conversion, data flows through the following path:
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1. **VMware VDDK** reads VM disk data from ESXi hosts via vCenter.
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2. The data stream is sent to the **centralized Windows Admin Center gateway**.
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3. WAC uses Microsoft APIs to write the data to the **destination Hyper-V host**.
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This design can lead to:
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- Increased WAN traffic
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- Higher latency during sync
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- Slower disk transfer performance when the WAC gateway is in a different region than source or destination hosts
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### Recommended Deployment Model: Distributed WAC Architecture
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To improve performance in multi-site or distributed environments, deploy **site-local WAC gateways** at each geographical location.
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**Benefits of a distributed model include:**
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- Conversion and sync traffic remains **within the same site**
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(for example: *Alabama → Alabama*), avoiding cross-region WAN routing.
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- Improved data throughput during VM sync and copy operations.
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- Reduced latency and network congestion.
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- Maintains centralized management while enabling **localized execution** of VM conversions.
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> [!Note]
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> This architecture is recommended for organizations with multiple datacenters, branch offices, or globally distributed VMware and Hyper-V infrastructures.
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### Direct ESXi-to-Hyper-V Transfer
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At this time, **direct ESXi → Hyper-V host-to-host transfer** without routing data through the Windows Admin Center gateway is **not supported**.
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All conversion traffic must be proxied through the WAC gateway as part of the current design.
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> **Best practice:** For optimal performance and reliability in geographically distributed environments, deploy the Windows Admin Center gateway in the same site as the ESXi and Hyper-V hosts involved in VM conversion.
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> Co-locating the gateway helps minimize WAN traffic, reduce latency, and ensure a smoother VM migration experience.
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