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ESX/ESXi 3.5 to 4.1

Last Modified: 2012-05-10
I have two hosts running ESX or ESXi 3.5.  I want the hosts upgraded to 4.1.  My understanding is it's best to do a CLEAN install and not an upgrade.

So far I've already setup my vSphere server, populated licenses, etc.  In fact I've been running vSphere client managing my hosts and vms for a while now.  I just haven't upgraded my hosts or vms to 4.1 yet.

Quick Notes:
My vSphere server is a separate physical machine.

I keep reading that I should migrate my vms to another host, then clean install 4.1 on host, then migrate the vms back to the host.

Because I'm doing this off hours, I can shut down all the virtual machines.  Not an issue.  

Will the following work:

1.  HOST A.   -  Power down all VMs.  (FYI, all VMs run off a NAS device not local)
2.  HOST A.  - Clean install 4.1
3. HOST A.  - Launch vSphere, hosts & vms should import automatically?

I guess I want to ensure nothing happens to my VMs on the NAS.  Once I've upgrade my HOST A to 4.1 (doing a clean install) I should be able to launch vSphere and everything should reimport?  Or do I have to manually import my vms and/or host A?
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