I'm outlining a plan to upgrade four ESX 3.5 U4 hosts to vSphere and I'd like some verification from the community that I'll be able to perform this upgrade with no downtime besides the VMware Tools Upgrades and the VMware Hardware Upgrades.
1) New install of vCenter
We want to change physical machines vCenter is running on. The databases aren't terribly important at the moment, so we're willing to have a fresh start on vCenter 4.0.
- Create new Datacenter
- Create new cluster
Questions: Do I need to add the current ESX 3.5 hosts to this cluster? Do I need to remove them from the existing cluster? Disable HA before doing that?
2) Host Upgrades
Do this for all 4 hosts:
- Put 1 host in maintenance mode, then shut it down.
- Fresh install of vSphere Re-add it to the same cluster
Questions: Can I run a vMotion from an ESX 3.5 host to an ESX 4 host? 3) VM Upgrades
For All VMs, done up to 4 days after the host upgrades (need a weekend for the downtime)
- Upgrade VMware Tools
- Power the machine down
- Upgrade Virtual Machine Hardware
- Power on the machine
Questions: Does this change the guest MAC address? Will we be OK running without the hardware upgraded for four days?