Intel Server Symposium NOW: System Design in the era of the "Killer Network" David Culler Computer Science Division University of California, Berkeley The natural evolution of the "killer micro" combined with the emergence of the "killer network" is likely to position networks of workstations (NOWs) as the primary computing infrastructure for science and engineering, and for internet services. They will provide a vast pool of computational and storage resources for demanding applications too large for the desktop, as well as the vehicle for interactive computing. In addition to moving parallel computing to a mainstream infrastructure, this transformation brings the opportunity to dramatically improve virtual memory and file system performance using the aggregate memory of a NOW as a giant cache for disk and by using collections of workstation disks as a soft RAID. In this talk we discuss technical challenges in exploiting these opportunities, including fast, general purpose communication, coordination of activity across multiple workstations, and organizing scalable servers. We will present preliminary results from the Berkeley NOW project.