Lustre is a storage architecture for clusters. The central component is the Lustre file system, which is available for Linux and provides a POSIX-compliant UNIX file system interface. The Lustre architecture is used for many different kinds of clusters. It is best known for powering seven of the ten largest high-performance computing (HPC) clusters worldwide, with tens of thousands of client systems, petabytes (PB) of storage and hundreds of gigabytes per second (GB/sec) of I/O throughput. Many HPC sites use Lustre as a site-wide global file system, serving dozens of clusters on an unprecedented scale. The scalability of a Lustre file system reduces the need to deploy many separate file systems (such as one for each cluster). This offers significant storage management advantages, for example, avoiding maintenance of multiple data copies staged on multiple file systems. Hand in hand with aggregating file system capacity with many servers, I/O throughput is also aggregated and scales with additional servers. Moreover, throughput (or capacity) can be easily adjusted by adding servers dynamically. Lustre has been integrated with several vendor’s kernels. We offer Red Hat Enterprise Linux (RHEL) and SUSE Linux Enterprise (SUSE) kernels with Lustre patches.