Can I add a 5.1 host to a cluster, where the other hosts are still 4.1?

[TedH256]

I know the answer must be yes, because that's how it works doing rolling upgrades. But this time I will have a new 5.1 host, and a newly upgraded vcenter, with the remaining hosts staying at 4.1 for a little while. Any concerns with this?

[a_p_ · Accepted solution]

That shouldn't cause issues, you just shouldn't create any VM's with a new HW version if you want to be able to migrate/vMotion them between the different hosts. For supported configurations see the VMware Product Interoperability Matrixes

André

[habeebth7]

I addition to a.p's response, if you have any VM with paravirtualization(vmi) enabled in any of the ESXi 4.x hosts, you cannot migrate/vMotion them to esxi 5.x. You will need to shutdown the VM, disable the paravirtualization and then migrate to the 5.x ESXi hosts.

Habeeb..

[OscarDavey]

I should work just fine for you.

[OscarDavey]

This will work just fine.

Yours, Oscar