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Question

migrate a VM from vSphere to AHV

  • November 25, 2025
  • 3 replies
  • 27 views
Z

Good morning,
I wanted to get a confirmation: if I have a VMware vSphere environment with VMs configured with Thick Provision disks (for example, a disk with 1 TB of allocated space but 500 GB of actual used space), when I migrate it to a Nutanix AHV environment, which supports only Thin disks, will the migrated VM consume 1 TB or 500 GB of real space on the cluster?

Additionally, if only the actual used space is taken into account, why does the Nutanix Sizer, when importing an RVTools file, base its calculations on the allocated space rather than the actual used space shown in the vPartition tab?

Thank you.

3 replies

BartDonders
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  • BartDonders
  • Outrider
  • November 25, 2025

Hi,

You are correct, the consumed space will be used on Nutanix. In your case 500 GB.

I prefer to make a sizing based on Collector output. Then you can choose by importing in sizer for ‘Provisioned’ or ‘Consumed’

 

Regards,

Bart

Z
  • zibippo
  • Author
  • Voyager
  • November 25, 2025

So can I be confident in always sizing based on the actual consumed space rather than the allocated space?
Does Nutanix Move always migrate only the consumed space, or are there specific cases where it also migrates the allocated space?  thank

BartDonders
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  • BartDonders
  • Outrider
  • November 25, 2025

I would never be confident on sizing based on actual consumed space. I always check the provisioned space as well. Actual growth in the environment as well as predictions for the future should also be considered.

About Move

Move is migrating based on snapshots. When seeding, multiple snapshots can coexist. Depending on change rate, you need additional storage. Space reclamation will be done afterwards, so it could be that you will temporarily need the complete amount of provisioned storage. I will check on that.

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