VM size different after moving to new Hyper-V cluster

Marcus Wong Theen Nam 1,091 Reputation points

We are doing a hyper-v cluster VM migration to new hyper-v cluster and the environment is as below:

cluster A (2 nodes) - Windows Server 2012 R2 nodes
cluster B (2 nodes) - Windows Server 2019 nodes

We've moved 1 VM role from the Windows Server 2012 R2 Hyper-V node to Windows Server 2019 Hyper-V node. Initially the source VM size in WS2012R2 hyper-v node is about 50GB, but after moving to the WS2019 hyper-v node the size became 70GB something. The VM is running fine but just the size was increased.

Appreciate for assistance/explanation on why the migrated size was increased.

Windows Server
Windows Server
A family of Microsoft server operating systems that support enterprise-level management, data storage, applications, and communications.
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A Windows technology providing a hypervisor-based virtualization solution enabling customers to consolidate workloads onto a single server.
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  1. JiayaoZhu 3,911 Reputation points


    Thanks for posting on our forum!

    Based on your description, I would like to firstly check how and where you observed that your VM size has increased by 20GB? And when you refer to VM size, you indicate VM OS file size or VM vhd size?

    If possible, would you please show us the screenshot for the console that depicts the increased VM size?

    Thanks for your support!


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