Between Christmas and the New Year, I plan to do a VMware ESX 3.5 cluster upgrade to vSphere. This will be 4 hosts in an HA/DRS cluster all upgraded to vSphere / ESX 4.0 U1.

The process should be similar to a regular host upgrade: Virtual Center (oops, vCenter), followed by the hosts, followed by the VM’s (tools and virtual hardware). There are a few different options when it comes to the upgrade including Update Manager, ESX host update utility, using install media at the console, … Will post again with the upgrade details.

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