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Data center convergence emerged to address the limitations of traditional infrastructure and storage, with the aim of finding ways to better integrate the discrete components that constitute IT infrastructure. The converged data center has evolved ever since. The data center convergence movement started over a decade ago with the introduction of converged infrastructure (CI), which offered a preconfigured hardware-based offering that streamlined infrastructure deployment and maintenance. Hyper-converged infrastructure (HCI) built on this trend by providing a preconfigured software-based offering that simplified IT operations even further. This was followed by composable disaggregated infrastructure (CDI), which combined elements of both converged and hyper-converged infrastructure to deliver greater flexibility and integrated support for automation and orchestration. These three infrastructures -- CI, HCI and CDI -- represent today's primary approaches to data center convergence. The lines between each type are sometimes blurred...