This is by design. The engine VM is migrated only manually (from the engine) or automatically by the HA agent on the host in case of failures detected in the infra. 

On 7 July 2016 at 11:34, Wee Sritippho <wee.s@forest.go.th> wrote:

Hi, I was trying to upgrade the hosted-engine environment from v3.6.5 to v3.6.7.

Upgrading host01 and host02 is OK. But when I was trying to put host03 (which has the engine VM in it) to maintenance mode, the process stuck - only the engine VM was migrated, another ordinary VM didn't.

I also noted that a lot of "Moving Host xxx to Maintenance" task was gradually created but didn't finished.

Here are the log files: https://app.box.com/s/ibi8pjxyxv4khek2menho1orumstek8y

-- 
Wee

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