Migrate to a New Virtual Machine Using VMware vCenter Converter

Last week, we posted an introduction to VMware cloud migration, focusing on preparation and initial considerations like training and measuring current server usage. Today, we’ll start a closer examination of the migration process itself, using the integrated vCenter Conversion tool.

These steps can be used to migrate infrastructure to any VMware environment, whether you are setting up virtualization in-house or partnering with a cloud provider for a remote private or public cloud.

Migration Tools

The method we will be examining is the free vCenter Converter tool from VMware, widely compatible with existing physical machines, VMs, and third-party images. It can convert Linux and Windows-based systems alike. 

Alternatively, if your existing infrastructure is already running VMware, you can simply add your new public or external private cloud to vSphere using the vCloud Connector. This can be accessed via the vSphere client or online at vmware.com.

VMs can easily be copied, moved between environments, and operated on with the vCenter Converter. Note: the vCenter Converter will not recognize volumes or file systems on disks that are 2TB or greater in size. The following formats are accepted:

Importable VM FormatsImportable 3rd Party ImagesCreated VM Formats

VMware Workstation
WMware Player
VMware Fusion
VMware ESX/ESXi
VMware Server
VMware vCenter Server
Microsoft Virtual PC
Microsoft Virtual Server
Microsoft Hyper-V

Symantec Backup Exec
Norton Ghost
Acronis True Image
StorageCraft
Parallels Desktop

VMware Workstation
VMware Player
VMware ESX/ESXi
VMware Server
VMware Fusion

Cold vs. Hot Cloning

The next decision to make is whether you will perform a cold or hot migration (AKA cold or hot cloning). Cold cloning involves powering down your machine, inserting a disc with an operating system and vCenter installed, and copying the entire powered down system. It creates a more exact copy of the machine state.

Hot cloning copies a machine as it is running, meaning some active processes may not be copied, but can be performed without any downtime. The Converter Standalone can also shut down relevant Windows processes based on user settings to avoid critical changes in the resulting VM. Converter Standalone can turn off the physical machine after conversion and power on the VM immediately for seamless migration.

Converting Physical Machines, Virtual Machines or Disk Images to a New Virtual Machine

The following example is a hot conversion of a Windows machine with no downtime. Install vCenter Converter and follow the wizard to set up conversion tasks. The Standalone agent takes a snapshot of the source volumes, creates a virtual machine on the destination server and then copies volumes across the network. It will automatically install required drivers so the operating system can boot on the virtual machine and personalizes some information like IP addresses. If set to do so, the agent will uninstall itself at the end of conversion.

When converting a Linux machine the process is slightly different. No agent is installed on the source machine, rather a VM is created on the destination host. This helper VM copies volumes using SSH and boots from an .iso file located on the Converter Standalone machine. After copying is complete the helper VM converts to a bootable VM containing the duplicated information.