How to Perform VMware Live Migration [Complete Guide]

What Is VMware Live Migration?

VMware live migration is the process of moving a running virtual machine (VM) between ESXi hosts or datastores without shutting down the workload. It is commonly used to achieve near-zero downtime during maintenance, upgrades, and workload balancing.

This capability is powered by VMware vMotion, VMware’s core live migration technology. vMotion transfers a VM’s memory and running state from the source host to the destination host while keeping the VM online, allowing applications and user connections to remain active during the migration process.

VMware live migration is different from cold migration. In live migration, the VM stays powered on with minimal service interruption, while cold migration requires the VM to be shut down before being moved.

Types of VMware Live Migration:

• Standard vMotion – Changing hosts only;
• Storage vMotion – Changing datastores only;
• Shared-Nothing vMotion – Changing both compute and storage simultaneously;
• Cross-vCenter vMotion – Migrating across different vCenter environments;

VMware Live Migration Requirements & Prerequisites

Before performing VMware live migration, administrators should ensure that the source and destination environments are properly configured.

• Host & vCenter Compatibility: Compatibility between ESXi versions and VMware vCenter Server is a fundamental requirement for VMware Live Migration. Proper licensing must be in place, and Enhanced vMotion Compatibility (EVC) should be configured to standardize CPU feature exposure across hosts, ensuring seamless workload movement between different hardware generations.
• Network Infrastructure Requirements: A stable and well-designed network is essential for VMware vMotion traffic. This includes dedicated VMkernel ports, sufficient bandwidth such as Gigabit or preferably 10GbE connections, and controlled latency—typically below 150 ms RTT for long-distance migration scenarios—to prevent delays or interruptions during live migration.
• Storage Configuration:Shared storage is a core prerequisite for live migration, enabling both source and destination hosts to access the same virtual machine files simultaneously. Common supported storage types include Fibre Channel, iSCSI, and NFS/VMFS datastores, all of which ensure data consistency and uninterrupted VM availability during migration.
• VM-Level Prerequisites: Virtual machines must meet specific conditions before disconnecting ISO or CD-ROM devices to avoid conflicts, and managing snapshots carefully, as excessive or chained snapshots can negatively impact performance or even block successful VMware Live Migration.

How to Perform VMware Live Migration with 2 Methods

VMware live migration can be performed through two methods, depending on the size and complexity of the environment.

Method 1: Performing Live Migration via vSphere Client (vCenter)

Step 1: Open vSphere Client, log in to the vCenter Server using the vSphere Client interface.

Step 2: Select the Virtual Machine, locate the target VM in the inventory.

Step 3: Right-Click and Choose “Migrate”;

Step 4: Select a migration type depending on your migration scenario.

Step 5: Select Destination Host or Datastore;

Step 6: Review Compatibility Checks;

Step 7: Start Migration, and click Finish to begin live migration;

The migration task can be monitored in the Recent Tasks panel.

Advantages of vSphere Client Migration

• Simple graphical management;
• Easy for daily maintenance operations;
• Suitable for small and medium VMware environments;
• No scripting knowledge required;

Method 2: Automating Live Migration via PowerCLI (For Clusters)

VMware PowerCLI is commonly used in enterprise VMware environments to automate large-scale live migration tasks. Compared with manual operations in vSphere Client, PowerCLI is more efficient for batch migration, cluster management, and automated maintenance workflows.

Step 1: Connect to vCenter

First, connect PowerCLI to the target VMware vCenter Server environment.

Connect-VIServer vcenter.company.com

Step 2: Migrate a Single VM

Use the following command to perform live migration for a single virtual machine.

Move-VM -VM "AppServer01" -Destination "ESXi-Host02"

Step 3: Migrate Multiple VMs

For cluster-wide operations, administrators can batch migrate multiple VMs simultaneously.

Get-VM -Location "Cluster01" | Move-VM -Destination "Cluster02"

Step 4: Perform Storage vMotion

PowerCLI can also automate Storage vMotion between datastores.

Move-VM -VM "Database01" -Datastore "Datastore02"

Advantages of PowerCLI Automation

• Suitable for large-scale migrations
• Supports automated maintenance workflows
• Simplifies batch VM orchestration
• Improves operational efficiency across clusters

Common VMware Live Migration Issues During Migration

Although VMware live migration is reliable, failures usually come from three areas:

“Changing the host of a virtual machine” Error

This issue occurs when CPU features are not compatible between source and destination hosts, or when Enhanced vMotion Compatibility is not enabled, preventing successful vMotion compatibility mapping.

Solution:

• Enable EVC to unify CPU feature baseline;
• Ensure ESXi versions and CPU generations are compatible;

Network & Timeout Interruptions
This issue is caused by unstable VMkernel connectivity or insufficient bandwidth during the final memory synchronization stage of migration.

Solution:

• Use dedicated VMkernel ports for vMotion traffic;
• Ensure stable 10GbE or higher bandwidth;
• Avoid congestion with production traffic separation;

Locked File & Storage Issues

This issue occurs when VM files cannot be accessed correctly, often due to mounted ISO images or temporary datastore connectivity loss.

Solution:

• Disconnect ISO/CD-ROM before migration;
• Verify datastore accessibility on both hosts;
• Resolve file lock issues by restarting ESXi management services;

Best Practices for VMware Live Migration

To improve stability and performance during VMware live migration, enterprises should follow several key best practices.

• Designating dedicated, multi-NIC vMotion networks

Use dedicated and multi-NIC vMotion network configurations to increase migration bandwidth, improve throughput, and provide redundancy during large VM migrations.

• Separating management traffic from migration traffic

Isolate vMotion traffic from management and production networks to prevent network congestion and ensure that migration operations do not impact running workloads.

• Scheduling mass migrations during off-peak hours to avoid storage IOPS spikes

Plan large-scale migration tasks during low-usage periods to reduce storage IOPS pressure, minimize performance impact, and improve overall migration success rates.

Beyond Native vMotion: Overcoming Enterprise Migration Limitations

Limitations of Native VMware Tools in Complex Environments

Native VMware migration tools are effective within VMware environments, but they have clear limitations in complex enterprise scenarios.

• Inability to perform native live migration from Hyper-V to VMware
  VMware tools do not support direct live migration from Hyper-V or other non-VMware platforms, limiting cross-platform migration capability.
• High risk and high bandwidth dependency in cross-cloud/multi-site migrations
  Cross-cloud or long-distance migrations rely heavily on stable high-bandwidth networks, making them more vulnerable to latency, packet loss, and operational risk.
• Lack of automated batch orchestration and rollback mechanisms
  Native tools provide limited support for large-scale automated migration workflows and do not offer robust rollback capabilities for failed migration tasks.

Enterprise Solution: Leveraging i2Migration for Seamless Data Mobility

To overcome the rigid boundaries of native virtualization tools , modern enterprises require a migration platform that brings flexibility, automation, and significantly lower risk to data mobility. This is where i2Migration steps in.

As an enterprise-grade migration engine, it resolves complex data center transitions through three core capabilities:

FAQs About VMware Live Migration

Does VMware live migration require shared storage?

Standard vMotion typically requires shared storage such as NFS, VMFS, or iSCSI datastores. However, Shared-Nothing vMotion can migrate both compute and storage resources without shared storage.

What is the difference between vMotion and Storage vMotion?

VMware vMotion moves a VM between ESXi hosts while keeping storage unchanged, whereas Storage vMotion migrates VM disk files between datastores without shutting down the VM.

How to perform VMware live migration between clusters?

It can be performed using vSphere Client, Cross-vCenter vMotion, or PowerCLI automation, depending on environment size and complexity.

Is Hyper-V to VMware live migration possible?

Native VMware tools do not support direct Hyper-V live migration. However, enterprise tools like i2Migration can enable cross-platform migration with minimal downtime.

Conclusion

VMware live migration enables virtual machines to move across ESXi hosts with minimal downtime. Technologies such as VMware vMotion, Storage vMotion, and Cross-vCenter vMotion help improve maintenance efficiency, workload balancing, and business continuity.

For large-scale or cross-platform migration scenarios, enterprise solutions such as Info2soft i2Migration can provide more flexible and automated migration management.