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Veeam Backup & Replication 9.5 Update 4
User Guide for VMware vSphere

Quick Migration

Veeam Quick Migration enables you to promptly migrate one or more VMs between ESXi hosts and datastores. Veeam Backup & Replication allows migration of VMs in any state with minimum disruption to business operations and end user access to services. You can use Quick Migration as a self-contained capability, solely for VM migration, or combine it with Instant VM Recovery.

Veeam Backup & Replication analyzes your virtual environment, its configuration, the state of VMs and selects the most appropriate relocation method. Whenever possible, Veeam Backup & Replication coordinates its operations with vCenter Server and uses native VMware vCenter migration mechanisms: vMotion and Storage vMotion. When VMware vCenter migration methods cannot be used (for example, if your VMware vSphere license does not provide support for vMotion and Storage vMotion, or you need to migrate VMs from one standalone ESXi host to another), Veeam Backup & Replication uses its proprietary SmartSwitch technology to relocate VMs.

Veeam Quick Migration provides means for fast background migration of VMs ensuring continuous uptime of your virtual environment. Quick Migration supports hot VM migration (with SmartSwitch) and cold VM migration (with cold switch). Both methods provide for no data loss during migration.

Migration of a VM is performed in several stages:

  1. Veeam Backup & Replication copies VM configuration (.vmx) to the target host and registers the VM.
  2. Veeam Backup & Replication triggers a VM snapshot and copies VM disk content to the new destination.
  3. VM state and changes made after snapshot creation are moved to the new location. Veeam Backup & Replication uses different approaches to move the VM state between hosts with compatible and non-compatible CPUs.
    • If you move a VM between two hosts with compatible CPUs, Veeam Backup & Replication uses SmartSwitch. Veeam Backup & Replication suspends the VM to move its state file and changes made after snapshot creation. The VM is then resumed on the new host. This method ensures minimum possible VM downtime during migration.
    • If you move a VM between two hosts with non-compatible CPUs, Veeam Backup & Replication stops the VM, moves changes made after snapshot creation, and then starts the VM on the new host.

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