Two Clouds, Twice the Operations: What Hybrid and Multicloud Actually Require
A second cloud does not make a system more available by itself. It adds a boundary, and whether that boundary helps depends on what you put across it.
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Cloud Bursting
Capacity you cannot reach in the ninety seconds the spike lasts is capacity you are paying to keep warm for nothing.
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Hybrid Cloud
Having a datacenter and a cloud account is not a hybrid cloud. The definition asks for portability between them, which is a capability someone has to build.