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I submitted a bug for this question:
https://bugs.launchpad.net/nova/+bug/1414947

This bug's status is wishlist, But I have a different opinion.

I have a use case:
Users may create some virtual machines for the processing of their 
business, these virtual machines use customized images which can meet 
their requirement. When users create virtual machines using these 
customized images in batches, they don't need to know the size of 
instance's root_gb, so they can use flavor with its disk size as 0.
In this case, the value of root_gb's filed in db table of instances is 0 
for every virtual machine, but it's real value is not 0. This will lead to 
live migrate failure since live-migration's destination compute node's 
disk_available_least is always less than 0.
We often enable disk_filter to control compute nodes's disk space, but 
when the value of root_gb's filed in db table of instances is 0, this 
filter doesn't work.

So, I think the value of root_gb's filed in db table of instances should 
be equal to image's virtual size in this use case.




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