What type of architecture does not scale well in the cloud?

Vertical architecture is characterized by a design that adds more power or capacity to a single node or server to handle increased load. This means that when a need arises for more resources, you would typically upgrade the existing hardware or server rather than distributing the load across multiple nodes.

In cloud computing, scalability is crucial for accommodating varying workloads. Horizontal architecture, in contrast, scales by adding more nodes to a system, distributing the load and thus improving performance and reliability. Hybrid and decentralized architectures also allow for more flexible scaling options depending on how they are structured – hybrid can take advantage of both on-premises and cloud resources, while decentralized can distribute workloads across different locations or systems.

Since vertical architecture relies heavily on enhancing a single point of failure, it can become a bottleneck and limit the flexibility and resilience that cloud environments are meant to provide. This is why it does not scale well in cloud settings.