incorrect OS version

Is server 2008 R2 an "option" for a VM OS when creating the VM. We have a list of installed OS does not match configured OS. At what stage in the VM do you "select" its OS? And what problems can arise if an admin accidentally selects the wrong OS? All our 64-bit Server 2008 R2 have been selected as windows 7 64-bit, so i was trying to understand the logic?
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pma111Asked:
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Zephyr ICTCloud ArchitectCommented:
Well ... As per VMware:

The guest operating system that you select affects the supported devices and number of virtual CPUs available for the virtual machine. The New Virtual Machine wizard does not install the guest operating system. The wizard uses this information to select appropriate default values, such as the amount of memory needed.

You select this option when you create a new Virtual Machine, it's best practice to choose the correct OS during the installation because this can (as described above) have impact on certain things ...

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rindiCommented:
What HyperVisor are you using as the host?
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
We've done this Question before, and the Answer is the same!!!!

You asked it on the 6th June 2014!

guests with wrong OS vcheck and vcenter

and I responded with

1.      At what stage during creating a new VM is this OS selected in vCenter?

At the very start of the New Virtual Machine Wizard, it asks you to pick an Operating System.

In my EE Articles here you can see the selection


Part 6: HOW TO: Create your first Linux Virtual Machine on a VMware vSphere Hypervisor 5.1 (ESXi 5.1) Host Server

Part 7: HOW TO: Create your first Windows Virtual Machine on a VMware vSphere Hypervisor 5.1 (ESXi 5.1) Host Server
2.      Does Microsoft Windows Server 2008 R2 (64-bit) exist in the options to select for the new OS in vCenter? Our admin seems to have selected Microsoft Windows Server 2008 (64-bit) as opposed to R2, is that a major issue? I did read that it should be a similar OS if the exact doesn’t exist as an option?

This is not a major issue, and it's likely that R2 did not exist in the options at the time, because you were using a earlier version of vCenter which did not have that option. e.g. even now with the latest version of vCenter Server, Windows 2012 R2 Server does not appear in the wizard, but Windows 2012 Server does, so it's completely acceptable to pick a like OS.

3.      Ultimately what is the risk in selecting the wrong OS? What can go wrong?

Very low risk, the wizard and OS Selection is there to setup a recommended setting for CPU, RAM and Disk Size for the initial virtual machine. Often they can mismatch with no ill effects.

4.      Where can you see a list of all OS supported by ESXi 5.1? Are there any major OS that ESXi does not support?

The HCL has the list here

http://www.vmware.com/resources/compatibility/search.php

Select Guest OS in the What you are looking for, will show ALL the OS, supported on ESXi.

Are there any major OS that ESXi does not support?

Not really, most OS work and are supported.
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