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Ayan1
Contributor
Contributor

"You cannot change the disk size if you take a snapshot"

Why we cannot modify disk if we have VM snapshot?

3 Replies
a_p_
Leadership
Leadership

This is most likely due to the metadata in the snapshot file(s) which cannot be reconfigured that easily, and resizing the base disk would require to reconfigure the snapshot files too. Snapshot files contain changed data blocks with a reference/pointer to the location in the base virtual disk, see VMware KB: Understanding virtual machine snapshots in VMware ESXi and ESX

André

lakshya32
Enthusiast
Enthusiast

Hi

Yes AP is right , if need to do then first need to merge snapshot .

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krish290785
Enthusiast
Enthusiast

If i am not wrong, when the VM is running on the snapshot, the base disk will be mounted in persistent Read-Only Mode and would not allow for any modify operations.

-Bala Krishna Gali If the above info is useful, please mark answer as correct or helpful.