When dealing with Azure instances that are under-performing, how do you decide when to scale the instances? Do you scale horizontally by adding more instances or vertically by making the existing instances more powerful?
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It depends on a lot of things (It'd be pretty hard to compare the two, but I'm sure someone who has enough time could find the real answer). However, all things being equal as far as total throughput of the two separate VS the combined, the extra instance option will give you some nice benefits: