How to use synchronization

[dhatfield]

Hi Guys,

I am doing a migration of Vms from VCenter/ESXi to Hyper-V. I have just finished testing how to use the synchronization feature. I can't find any documentation on it.
From what I can see. It performs a snapshot on first copy, it then copies the initial disk (on my system it is copying at approx 410Mbps). Once the initial copy is completed, it creates a 2nd snapshot, it then runs a new copy which runs about 25% quicker. Once the 2nd copy is finished, the process is complete but there is only one VHDX file on the Hyper-V end so it looks like it has merged the data from the 2nd copy on the fly. Is this correct?
Also, my original disk was 60GB and the snapshot was only 1GB but the time to copy was 20mins for the 1st copy and 15mins for the 2nd copy.
Am I reading this right? I am trying to understand the use case for this.
NOTE: I have a couple of servers that are approx 2-3TB so synchronization may be a good fit but if the 2nd synch only performs 25% quicker and finishes after one snapshot and doesn't shutdown the original VM and startup the new VM then this function may not do what I need.

[yaroslav (staff)]

You can convert the VM live and it will make snapshots to let the destination catch up with the changes you made.

[dhatfield]

Hi Yaroslav,

But from what I could see, it only does this once and it doesn't shut down the original VM so if the job completes and you haven't manually shut down the original VM then you need to rerun the job from scratch.

I thought that you could run it and it would continue making snapshots until such time as you power off the original VM and then it will complete the final pass.....

Is this not how it works?

[yaroslav (staff)]

Hi,

You do not need to power off the VM. There is only one snapshot taken and then is merged to the source so everything written to the VM during conversion is not lost.