Sometimes we can mount a VHDX that had its checkpoints saved on another location. When trying to boot the VM we will have a “Property ‘MaxInternalSize’ does not exist in class ‘Msvm_VirtualHardDiskSettingData’.”
This is because the disk properties have changed and the VM is linking the checkpoint back to its parent, making the chain corrupted.
To remediate this, we will use the Set-VHD powershell snippet
Set-VHD "D:\path\Disk_CHECK2.avhdx" -ParentPath "D:\path\Disk_CHECK1.avhdx" Set-VHD "D:\path\Disk_CHECK1.avhdx" -ParentPath "D:\path\Disk.vhdx"
Here we are stitching the newest checkpoint (Disk_CHECK2) to (Disk_CHECK1); then Disk_CHECK1 to the main Disk.VHDX.
Now, its very likely that you will receive a mismatch error:
“There exists ID mismatch between the differencing virtual hard disk and the parent disk. “
For this we will use the –
Set-VHD "D:\path\Disk_CHECK1.avhdx" -ParentPath "D:\path\Disk.vhdx" –ignoreidmismatch
And now you will have a booting VM again!
Just wanted to let you know, you post 100% saved me from a ton of work needed to rebuild a production VM with a corrupted virtual hard disk (my fault). Thank you so much for taking the time to post this with such clean and concise detail.
Cheers!
Thank you!
Thank you for this manual! You saved me lot of time
Thank you so much for this. You saved me hours of frustration and a lot of stress.
Hi Sebastián
Great post, thank you very much, you just saved my life !!
Thank you!!! Saved me a ton of work!!!
“It just works”. Thank you so much kind sir, you are a gentleman and a scholar.
Thank You !
“It just works”. Thank you so much bro, you are a hero
Thanks! I just stumbled across this error and your posts helped me fix it.
Cheers, Pierre
You are the MAN!!!
How do you know which one is the latest AVHDX and what it’s linked to?
I restored an entire folder so they all have the same date.
You can use the inspect disk feature on Hyper-V to see who’s the parent:
https://social.technet.microsoft.com/Forums/en-US/b65b8e87-7534-41dc-8e88-49cb31408aa0/hyperv-broken-parent-chain
You just saved my day! I was looking at two days work down the drain since I had mounted a drive with checkpoints…
NO idea how it got messed in in the first place but this saved the day!
Thanks!
Worked great, power outage killed it, this fixed it in seconds, thanks.
Great Job, your post save my night…Thank You
thank you … it worked for me too.. My VM’s had k8s test setup and all worker nodes disks were corrupted ..
Thanks bro