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> From: Ed Leafe [mailto:ed at leafe.com]
> On Nov 5, 2015, at 2:43 AM, Tang Chen <tangchen at cn.fujitsu.com> wrote:
> 
> > I'm sorry that I cannot understand why resize and migrate are the same
> thing behind.
> 
> Resize is essentially a migration to the same host, rather than a different
> host. The process is still taking an existing VM and using it to create another
> VM that appears to the user as the same (ID, networking, attached volumes,
> metadata, etc.)
> 



Or more specifically, the migrate and resize API actions both call the resize
function in the compute api. As Ed said, they are basically the same behind 
the scenes. (But the API difference is important.)