Explore a groundbreaking approach to operating system design in this 26-minute conference talk from USENIX ATC '19. Delve into LegoOS, a disseminated, distributed OS for hardware resource disaggregation that challenges the traditional monolithic server model. Learn how the splitkernel model disseminates OS functionalities into loosely-coupled monitors, each managing a hardware component. Discover how LegoOS separates processor, memory, and storage devices at both hardware and OS levels, offering improved heterogeneity, elasticity, resource utilization, and failure handling in datacenters. Examine the implementation and evaluation results, comparing LegoOS's performance to monolithic Linux servers and exploring its benefits in resource packing and failure rate reduction. Gain insights into the future of datacenter management and the potential of hardware resource disaggregation in this award-winning presentation.