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Yizhou Shan†∗, Yilun Chen∗, Yutong Huang∗, Sumukh Hallymysore∗, Yiying Zhang Purdue University,∗ are students,† will present the poster Recently, there is an emerging interest in datacenter resource disaggregation [1, 2, 3], an architecture that breaks monolithic servers into independent hardware components connected through network. OSes built for monolithic computers can not handle the distributed nature of disaggregated hardware components. Datacenter distributed systems are built for managing clusters of monolithic computers, not individual hardware components. When traditional OS operations spread across hardware components over the network, these distributed systems fall short. Clearly, we need a new operating system for the disaggregated architecture. We propose the concept of decomposed operating system for the disaggregated datacenter architecture. The basic idea is simple: When hardware is disaggregated, the operating system should be also. There are three main challenges in building a disaggregated OS: 1) How to cleanly separate OS services and map them to hardware components? Traditional OS services are tightly coupled, which assume all hardware resources are accessible within the same machine. Resource disaggregation calls for a clean separation of OS services; only when OS services are cleanly separated can disaggregated components be flexibly deployed and reconfigured. Furthermore, different hardware components have different constraints. For example, processor component will only have limited memory, while memory component will only have limited processing power to handle …