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Ok, I think I'm getting it.
1. Upgrading your vCenter Server to version 5 ( which able give you benefit that no need two times upgrading, to the version 5 and also able to managed version 5 and 4 node), If you upgrading to version 4 update 2, you are not able to managed version 5 ESXi host node.
Can this upgrade to vCenter Server be done while the cluster is active? Or, do I need to shut down each VM, place the hosts into maintenance mode, etc.
If I upgrade all the way to v5, I understand it will allow me to manage my v4.1 cluster and will also be able to handle the addition and migration of v5 hosts.
2. Upgrade your vSphere Client
Sounds like the easiest step! I assume I can upgrade to v5 and it will allow me to manage the VMs whether they are v4 or v5, correct?
3. Migrate your VMs on host A to Host B
Is this needed? I am able to shut down the VMs while the upgrade happens. So, can I simply shut down the VMs on the host that is to be upgraded, then restart the VMs once the host has been upgraded?
4. Upgrading your ESXi 4 to update 2 on host A (via CD installation or update manager)
I still have an issue with this as I need to better understand the process of loading Update Manager with the update to be loaded, and actually applying the update. I will continue to read up on this.
5. Migrate your VMs on host B to host A.
6. Upgrading your ESXi 4 to update 2 on host B
7. Upgrade your VMware Tools
Is this in reference to each VM? So, on each VM, perform the Install/Upgrade VMware Tools option from the Guest menu in vSphere Client?