[ianamartin]

That's not how green/blue deployments work. You don't keep both colors up unless you have completely failed to understand the concept.

Green/Blue is all about saving resources and costs, not keeping them around. You misread the cause here. It has nothing to do with deployment strategies.

[bigiain]

That's not how I read what the OP's doing in the article. Sure, maybe he's not doing "proper blue/green", but that is what he uses to explain running a duplicated pair of web/app servers full time...