Deep Dive into the VMware VMotion

What is VMotion in VMware


VMotion is VMware technology which allows you to migrate your live running VM server from 1 physical server to another without any downtime, which allows you to have your server service/applications continuously available. This is very much helpful during your planned activity of your physical server without need of any downtime to the VM server which runs on that physical server which hosts these VM servers.




How does VMotion works?

When you do VMotion of VM, the entire state of VM is encapsulated by a set of files stored in shared storage. The filesystem used in VMware i.e. VMFS (VMware file system) allows multiple ESXi servers to access same set of files concurrently.


  • Than the active memory and execution state of VM is rapidly transferred over the high speed network. VMware keeps track of on going memory activity during VMotion activity.



  • Once the entire system state and memory is copied over the network to other ESXi server, VMotion suspends the VM from current host and transfers the remaining active memory activity and resumes it on the target ESXi server. This entire process takes less than 2 seconds on high speed network.


  • VM’s network is also virtualized by the underlying ESXI server which ensures VM’s network identity to be preserved. VMotion manages the virtual machine MAC address as part of the VMotion process and once the VM machines is been resumed VMotion pings the network router to make sure it is aware of the new physical location of MAC address. Since the migration of VM with VMotion preserves the precise execution state, the network state and identity and this results in zero downtime.


Hence even users who are continuously working on this VM servers doesn’t seems to see any difference even though at background it is been migrated from one physical ESXI server to another ESXi server.

So this is how VMotion works at the backend.

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VMware vSphere 6 Awesome Features – Rajesh Poojary

VMware had always given the best in features , but we were looking for some more features from VMware and here it comes  with vSphere 6 🙂

I have listed few features hope you will love these to know.

vSphere 6 Features and Enhancements:

1)      VMware cluster now supports up to 64 nodes in cluster and 8,000 VM’s.

2)       ESXi Hosts now supports up to : 1000 VM’s ,12 TB RAM , 480 CPU’s and 64 TB datastores.

3)      VM’s hosted now supports up to 4TB vRAM and 128 vCPU’s.

4)      vSphere Fault Tolerance: Here comes the long awaited features which can save lots of engineer by doing extra hours of work and can help mission critical applications to keep always up.

a)      Now FT supports up to 4 vCPU’s and 64 GB RAM.

b)      Earlier versions had limitations of not been able to take snapshots of FT enabled VM’s, this limitation has now been removed and Snapshot is possible of the FT enabled VM’s in vSphere 6, thereby enabling some of the VM backup software’s which relies on Snaphot’s to work  FT enabled VM’s.

c)       In earlier version FT VM’s should reside in same shared storage and using the same disk, but in vSphere 6, Primary and Secondary VM has it’s own .VMX and own .VMDK files, which can be placed in different datastores and are in continuously sync with each other thereby reducing performance issues also.

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