Hi everyone,

I wanted to share the good news: our main oVirt instance in PHX is now
running the latest 4.2.0 release candidate. This is a Hosted Engine setup
that went through lots of updates and hosts most of the services for the
project such as the entire CI setup, package repositories, mailing lists
and lots of other stuff across hundreds of VMs and a dozen of hosts.

During this upgrade we've tested multiple components since our setup uses
many of the customization options offered by oVirt: unusual network
configurations, resource quotas, local and shared storage domains and even
uncommon hardware architectures such as POWER8.

We faced some problems with Hosted Engine during the upgrade since our
environment was deployed way back as 3.4 and HE changed a lot since. Short
upgrade guidance:
1) no HE -> just upgrade and enjoy
2) HE on a system that was initially deployed as 4.0 or 4.1 -> upgrade HE
hosts, then - the engine
3) HE on a system that was initially deployed before 4.0 -> check out [1]
to confirm if HE configs are OK, then upgrade HE hosts, then - the engine

I've reported several bugs during the course of this upgrade and most of
them are fixed by now. Hopefully this effort will make your upgrades go
smoothly. If you hit any issues with 4.2 - please file bugs as well or
start a discussion on the list.

-- 
Regards,
Evgheni Dereveanchin

[1] https://bugzilla.redhat.com/show_bug.cgi?id=1521011
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