Exchange 2013 Multi Role Boot Sequence

Hi there,

I was wondering if in a Multi Role Setup of Exchange 2013 there is a guideline in what order you should reboot your Roles in case you need to reboot?

For Example:

1. restart Mailbox role
2. restart CAS role

or

1. restart CAS role
2. restart Mailbox role

Also is there a guideline rebooting Exchange 2013 together with your DC's? I tried searching online and in Forums, but no luck yet. Kind Regards...