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If I create a VMware virtual image on my Mac (with VMware Fusion 2) it creates a file line Ubuntu.vmwarevm. Will this file be compatible with a ESXi 4.0 server? In general, are virtual machines for VMware all the same format?

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I think you're confused. You don't install ESXi on a Windows Server. IF you're installing on top of an existing OS, you're probably using VMWare Server. If you're using ESXi, it is a standalone hypervisor. – MDMarra Jan 25 '10 at 12:38
I see, vmWare has it's own linux-based kernel.. So no windows involved.. Still, do the virtual images created by vmWare fusion run on a ESXi server? – luca Jan 25 '10 at 13:06
up vote 3 down vote accepted

In theory, yes, they do. That being said, not everything is as simple as the marketing would have you believe. A more obvious example is that on OS X you can create an OS X vm, but you will have a hard time getting that to run on another platform because there are certain requirements that are specific to the Fusion product.

There are aslo different vmWare "hardware" versions to consider and the documentation of the chosen source/destination will outline differences and compatibility issues.

So there is not a strait forward answer for this question. Anyone who tells you simply yes or no has not tried to do this himself, or is a marketing guy for vmWare... :-D

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Virtual machines created with Fusion 2 should be compatible with the latest version of ESX/ESXi server.

From the new virtual machine wizard:

alt text

All you will need to do is copy the root folder that contains the .vmx (configuration file) and the .vmdk (virtual hard drive) folders to another machine and import and it should be able to run just fine.

(In addition, you may however lose snapshot/paused state going from one product to another... I have not tested this and cannot be certain.)

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