On Mon, Jun 4, 2018, 3:10 PM Arman Khalatyan <arm2arm@gmail.com> wrote:
Hello everybody,

I wondered if one could first upgrade the engine machine before
upgrading the hosts.

Yes. 

Is the engine 4.2.x is backwards compatible with 4.1.x?

Yes. 
Y. 



Thanks,
Arman.
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