Auto-Start Guest Virtual Machines in XenServer 7.x

XenServer 7.3 changed the way auto startups worked. 

You first need to get the POOL id:

xe pool-list | grep uuid
uuid ( RO)                : 5e9cda02-a5e0-ee75-26fe-caba7b4dfe04

Next you will need to enable auto startup on the pool master.

xe pool-param-set uuid=5e9cda02-a5e0-ee75-26fe-caba7b4dfe04  other-config:auto_poweron=true

Now that you have turned on the auto-start feature, you can enable individual machines to auto start.

xe vm-list
uuid ( RO)           : 017126c8-dc39-7c10-f0f2-886a8267458c
     name-label ( RW): win10
    power-state ( RO): running

enable the uuid of the individual VM you want to startup on boot.

xe vm-param-set uuid=017126c8-dc39-7c10-f0f2-886a8267458c  other-config:auto_poweron=true

Start Order and Start delay

Now you can set the start order and delay in XenCenter.

Conclusion

The auto start feature is disabled because of a HA environments. If your using a standalone XenServer this allows you to configure settings in Xen for auto start up. Don’t forget to backup of your VM’s.