A few months ago I blogged on upgrading an Oracle VM environment from 3.3.4 to 3.4.1, and in that spirit (and with a few variations) I just did an upgrade from 3.4.1 to 3.4.2.
As before, I upgraded my lab systems (one Oracle VM Manager controlling an x86 server pool and a SPARC server pool) using the Upgrading Oracle VM instructions. The Manager upgrade was done first and that was completely by the book (mount the ISO image, run ./runInstaller.sh, and so on) with nothing exciting to report. After a few minutes I had the Manager at 3.4.2 level.
However, I used some variations for the servers. Before upgrade, the Oracle VM Manager instance was at the public 3.4.1 version, but the x86 servers were at an earlier internal test build (yes, I know: I should have synced it up long ago. My bad). To simulate customer experience I upgraded the servers to the official Oracle VM Server 3.4.1 level and then upgraded them to Oracle VM Server 3.4.2. This was the regular, documented process - I just did it twice with different Yum repository contents. A slight difference is that I created the repositories on one of my SPARC servers running Solaris instead of on x86 running Linux. No real reason except that I have those machines handy. The commands were almost the same as in the documentation, except for the slight differences for the mount command and the directory where I put the files.
Finally, I upgraded the SPARC portion of this lab. Instead of doing the method I've used in previous upgrades (update the server update repository, run the update from the Oracle VM Manager user interface), for a change I deleted a server from the Manager, uninstalled all presence of Oracle VM Manager's OVS agent, and then did a fresh install using the current OVS agent and Distributed Lock Manager (DLM). That worked just fine, and then I took another minute or two to re-present network definitions and repositories.
The net result is that this lab environment is now running Oracle VM Manager 3.4.2 with Oracle VM Server for x86 3.4.2, and Oracle VM Server for SPARC 3.4 (the release numbers vary slightly) and with the OVS agent corresponding to the Manager version.