new esx server to be joined to HA cluster - what version of ESX?

[mark_a_k]

we are adding a 3rd esx server to an existing HA cluster (2 esx servers). The 2 existing servers are esx 3.0.1.

my intention is to install v3.0.1 on the new server and add it to the HA cluster - then consider upgrading all 3 servers later.

Is is possible for me to install esx 3.5 on the new server and add it to the existing HA cluster v3.0.1?

thanks for any responses.

[vWhere09]

ESX 3.0.x and 3.5 can reside in the same cluster just fine. Just make sure you leave the VMware tools as "out of date" until you get all you ESX hosts on the same build level.

When adding hosts into a cluster, add them in in maintenance mode, then exist matenance mode and let the cluster configure your host(s) for HA.

[lmonaco]

Sounds like you are dealing with some old versions there. Matter of fact not even supported by VMware anymore. Make sure the version of vCenter you have can support your 3.5 hosts.