Why VxRail-to-Hyper-V migrations are different

VxRail is built as a tightly integrated VMware stack – vSphere + vSAN + lifecycle management optimized around VMware vSAN storage policies and data placement.
Moving to Hyper-V usually means you’re replacing not only the hypervisor, but also the operational model (patching, monitoring, backup tooling) and often the storage architecture (vSAN vs SAN/NAS vs Storage Spaces Direct).

This runbook is the approach we use when the goal is: stand up Hyper-V in parallel, migrate safely, validate thoroughly, then decommission VMware/VxRail.

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Phase 0 – Decide your target Hyper-V architecture (before you migrate)

Pick one primary design so you don’t migrate twice:

Option A: Hyper-V cluster + SAN/NAS (disaggregated storage)
Compute cluster is separate from storage; VMs live on shared storage presented to the cluster.

Option B: Hyper-V cluster + Storage Spaces Direct (S2D) (hyperconverged)
Compute and storage scale together, similar in spirit to HCI.

Option C: Standalone Hyper-V hosts (small deployments / special use cases)
Useful for limited workloads, but you give up cluster-based HA for most workloads.

If you’re used to vSAN resilience rules, you’ll want an equivalent resiliency target in Hyper-V (cluster + shared storage, or cluster + S2D).

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Phase 1 – Inventory and readiness (what to capture in week 1)

1) Workload inventory (VM by VM)

• VM name, OS, CPU/RAM, disk sizes, datastore location
• NIC/VLAN details
• RPO/RTO requirements (by app)
• Dependencies (DCs, DNS, DHCP, SQL, line-of-business apps)

2) Clean up the VMware side

• Remove/merge snapshots
• Confirm backup success + restore test for critical apps
• Verify CBT status where you plan to use tooling that relies on it (common with conversion/replication tools)

3) Choose your migration method
Most organizations use one of these:

Method 1 (Microsoft-native): Windows Admin Center VM Conversion extension
Microsoft provides a guided workflow to connect to vCenter, run prechecks, synchronize, and migrate VMs to Hyper-V. It includes prerequisites like PowerCLI, VDDK, and “no active snapshots.”

Method 2 (Replication-based): backup/replication tooling (often fastest for big environments)
Useful when you want low downtime cutovers and repeatable wave migrations.

Method 3 (Manual conversion): convert VMDK → VHDX and rebuild VM config
Works, but tends to be slower and more error-prone at scale.

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Phase 2 – Build the Hyper-V landing zone (parallel platform)

Before you touch production workloads, build the target correctly.

1) Install and patch Windows Server on the hosts
Choose a supported Windows Server version across all nodes and keep it consistent.

2) Add required roles/features

• Hyper-V
• Failover Clustering (if clustering)
• MPIO / iSCSI initiator (if using SAN/NAS, depending on design)

Microsoft’s cluster requirements documentation is your baseline.

3) Configure networking intentionally
Plan for:

• Management
• VM traffic
• Live Migration
• Cluster heartbeat
• Storage traffic (if applicable)

Microsoft provides specific Hyper-V cluster network recommendations and isolation/QoS guidance.

4) Configure storage

• If SAN/NAS: present shared volumes to all nodes and configure CSVs where appropriate
• If S2D: follow an S2D design and validate hardware alignment

Microsoft outlines storage architecture patterns for failover clustering so you can match your resilience goals.

5) Run Cluster Validation
Cluster Validation isn’t optional for a stable platform; it’s where you catch driver, storage, and networking misalignments early.

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Phase 3 – Migrate VMs (step-by-step using Windows Admin Center VM Conversion)

This is a practical flow aligned to Microsoft’s documented process.

Step 1: Prepare the Windows Admin Center (WAC) gateway

On the WAC gateway machine, ensure prerequisites are met (commonly includes):

• VMware PowerCLI installed
• VDDK placed in the required path
• VC++ redistributables as required
• No active snapshots on the VMs you will migrate

Step 2: Connect WAC to vCenter

• Open WAC → Extensions → VM Conversion
• Connect to vCenter using FQDN and credentials

Step 3: Synchronize (seed) VM data

• Select VM(s) → run prechecks
• Choose the target path on Hyper-V storage for the VHDX seed
• Let sync complete before scheduling cutover

Step 4: Migrate (cutover)

When you start migration, WAC typically:

• Runs migration prechecks
• Performs delta replication
• Powers off the source VM
• Executes final delta sync
• Imports the VM into Hyper-V

Plan your cutovers in waves: non-critical first, then business-critical after you’ve proven the process.

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Phase 4 – Post-migration validation (the part that prevents surprises)

1) Boot and OS health

• Confirm clean boot, services start, event logs are clean
• Confirm time sync and domain join status

2) Network validation

• Verify IP, VLAN, DNS, routing, firewall rules

3) App validation

• App owners sign-off on core transactions

4) Backups + DR

• Confirm the VM is protected in your backup platform
• Validate restore (at least one critical workload)

5) Performance sanity checks

• Storage latency (especially if moving off vSAN to a new storage stack)
• CPU ready equivalents / host contention

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Phase 5 – Decommission VxRail safely

Only after business sign-off:

• Confirm all VMs are migrated
• Remove host dependencies (monitoring, backup hooks, scripts)
• Archive configs
• Decommission per operational and security requirements

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Abtech Services

Abtech Technologies can provide this as a service. We can:

1. Design the solution to include best of breed Dell hardware
2. Deploy the hardware
3. Plan and implement the migration from VxRail to Hyper-V
4. Provide training and validation