VM image converter (VMDK, VHD, VHDX, IMG, RAW, QCOW and QCOW2), P2V migrator
Moderators: anton (staff), art (staff), Anatoly (staff), Max (staff)
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ClearChowder
- Posts: 1
- Joined: Mon Jan 15, 2018 11:14 pm
Mon Jan 15, 2018 11:24 pm
I'm converting a vmdk file to be compatible with ESXi.
Is there an option to thin provision the vmdk file? As I step through the V2V Converter wizard, I do not see it.
My new vmdk file is 125GB, whereas the original file is only 21GB.
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Boris (staff)
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Tue Jan 16, 2018 10:37 am
In the current release it is not possible to convert a file into thin provisioned ESXi vmdk. This functionality is planned to be added in further releases.
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mcisar
- Posts: 1
- Joined: Sun Apr 24, 2022 6:37 pm
Sun Apr 24, 2022 6:39 pm
Just wondering if the ability to output a thin .vmdk has been added since the original post in 2018?
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yaroslav (staff)
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Mon Apr 25, 2022 10:21 am
Hi,
No, the feature has not been added so far.
Please note that thin disks might be causing potential performance issues and result in overprovision of the storage.
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jumlouhasa
- Posts: 1
- Joined: Mon Jan 08, 2024 9:31 am
Mon Jan 08, 2024 9:32 am
huntshaded wrote:Yes, it's been out for a while, I've been using it
How do you see the quality? I'm looking to start using it.
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BobbiBenjamin
- Posts: 1
- Joined: Tue Aug 20, 2024 5:00 pm
Tue Aug 20, 2024 5:02 pm
If you have already converted the VMDK file and it’s not thin-provisioned, you can convert an existing thick-provisioned VMDK to thin-provisioned directly within ESXi.
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anton (staff)
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Thu Sep 12, 2024 6:16 pm
Thank you for your hint! It will work.
BobbiBenjamin wrote: ↑Tue Aug 20, 2024 5:02 pm
If you have already converted the VMDK file and it’s not thin-provisioned, you can convert an existing thick-provisioned VMDK to thin-provisioned directly within ESXi.
Regards,
Anton Kolomyeytsev
Chief Technology Officer & Chief Architect, StarWind Software

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GaelBrown
- Posts: 1
- Joined: Wed Mar 26, 2025 1:09 pm
Wed Mar 26, 2025 1:11 pm
ClearChowder wrote: ↑Mon Jan 15, 2018 11:24 pm
I'm converting a vmdk file to be compatible with ESXi.
Is there an option to thin provision the vmdk file? As I step through the V2V Converter wizard, I do not see it.
My new vmdk file is 125GB, whereas the original file is only 21GB.
You can select "Thin" under disk settings or converting it later in ESXi using the vSphere Web Client.