The National Center for Atmospheric Research (NCAR) has begun operation of Cheyenne, a 5.34-petaflop supercomputer that will support a range of research related to weather, climate, and other Earth sciences. The system is currently ranked as the 20th most powerful system in the world, with a Linpack mark of 4.79 petaflops. Cheyenne was built by SGI, which is now a part of Hewlett Packard Enterprise. The hardware consists of Intel “Broadwell” Xeon processors (18-core 2.3GHz E5-2697v4) and Mellanox EDR InfiniBand. The system encompasses more than four thousand dual-socket nodes, one-fifth of which are equipped with 128GB of memory, with the remaining four-fifths containing 64GB. Total memory capacity is 313 terabytes. External data storage consists of 20 petabytes of DDN’s SFA14KX systems, expandable to 40 petabytes. Aggregate I/O bandwidth is 200 GB per second. Forty-eight 800GB SSD drives are included to speed metadata access. The storage system is overlaid by IBM’s Spectrum Scale parallel file system (formerly GPFS). Cheyenne’s storage will be integrated in the center’s existing GLADE central disk resource, providing access to more about 37 petabytes of capacity. Learn more at https://www.top500.org/news/ncar-launches-five-petaflop-supercomputer/