Posts Tagged ‘live migration’

What do we mean by ‘live migration’

September 19th, 2011    Posted in virtualization

Microsoft has revealed a solution to one of the vital problem which has crop up in virtualization i.e. movement of an operational VM across WAN (wide area network). This solution is a latest release of Microsoft i.e. Windows Server operating system which shall be available in Microsoft’s Hyper-V version 3 hypervisor. The feature of this new release was made known to people at the Microsoft BUILD conference in Anaheim, California.

Within the virtual machines, there are certain applications which has made working VM move from one computer to another. This has been made possible with live migration and that too without any disruption. There are various software providers which allows you to avail live migration services within your local network but the challenge comes when live VM across different subnets, or separate WAN sub-networks. This concept has become difficult due to the complexities related to network latencies and network addressing.

Its working principle was explained so that it becomes easier for the users to make utilization of the same. Two internet protocol addresses has been provided for each virtual machine out of which one address is used as the home address for the respective virtual machines and it has been considered for communicating with the other net works. And in case it has been accessed publicly then communicate with the internet. Second address is basically allocated for the local data center. However this solution is made more effective with the use of Overlay Transport Virtualization (OTV) technology because it provides Cisco networking gear which makes the entire concept work for the purpose.


  • VMs can be saved on thumb drives or optical disks, and directing it to the new location so that the virtual machines can be updated incrementally with the latest changes.
  • VM’s virtual hard disk can be migrated live with the help of this solution.
  • This software can be scalable.
  • In order to create virtual storage disk that too with a dimension of 16 TB in size, you can consider the usage of a new virtual file system called VHDX.
  • This software would allow the system to support 32 virtual processors for every individual virtual machine and it also provides an appropriate memory size of 512 GB.

There are certain emergency situations where this release can be proved to be handy such as due to upcoming threat of flood or hurricane, if your data center is at risk then the software allows that the content might be moved to another facility. But as we know the moving of content depends upon the sizes of most data center-run systems as a result we have seen that only a handful of VMs can move at the same time.

Another appropriate situation would be permanent migration of systems. This means that without undergoing any downtime effect, this technology allows one data center to migrate to the next data center that too permanently. This would become most important for us when we would deal with data center consolidation projects.

No Comments