ABSTRACT
Joint Institute for Computational Sciences (JICS) proposed to deploy a 1-petaflop (PF) peak performance Cray XT5 system later named Kraken. This chapter describes the program background, timelines, upgrades, integration activities, acceptance testing, and a system overview of Kraken. Kraken is a series of Cray XT systems that culminated in a 112,896-core XT5 system that has 147 TB of memory and 2.4 PB of dedicated formatted disk space. The Cray XT operating system, Cray Linux Environment (CLE), is a distributed system of service-node and compute-node components. The management tools that power Cray XT systems help ease the task of administering large supercomputers. Kraken has access to three major storage resources. These include a Network File System (NFS), Lustre filesystem, and High Performance Storage System (HPSS). Kraken's archival data system is HPSS which is developed and operated by Oak Ridge National Laboratory's (ORNL) National Center for Computational Sciences (NCCS).
