We are planning on upgrading our ESX hosts from ESX 4.1 to ESXi 5.1 Our preferred method of upgrading is via Update Manager. In the Update Manager 5.1 documentation it states the following:
"ESXi 4.x to ESXi 5.x UPGRADE is supported and ESX 4.1 to ESXi 5 MIGRATION is supported. Anyone know what the difference between an upgrade and a migration are? Am I going to need to completely rebuild the host or will it maintain it's settings.
Also is running different versions of ESX (ESX 4.1 and ESXi 5.1) withing the same cluster, supported? Any other considerations when running different versions within the same cluster. This will only be a temporary issue while we work to get all hosts upgrade.
Thanks.
J