Put cluster in global maintenance.  Update hosted engine to 4.2.  Once it comes back up put one of your hosts in maintenance mode, upgrade it then set back to active.  Do this for each host until you are done.

On Mon, Jun 4, 2018 at 9:09 AM, Arman Khalatyan <arm2arm@gmail.com> wrote:
Hello everybody,

I wondered if one could first upgrade the engine machine before
upgrading the hosts.
Is the engine 4.2.x is backwards compatible with 4.1.x?


Thanks,
Arman.
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