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OpenMP
An API that supports multi-platform shared-memory multiprocessing programming in C, C++, and Fortran on most processor architectures and operating systems. It consists of a set of compiler directives, library routines, and environment variables that influence runtime behavior. See KB article 209.
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OSS
Object Storage Server; service nodes of the Lustre filesystems at NAS that run the Lustre software stack, provide the actual I/O service and network request handling for the Object Storage Target (OST), and coordinate file locking with the MDS. Each OSS can serve up to around 15 OSTs. See KB articles 224.
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OST
Object Storage Target; storage devices on the Lustre filesystems at NAS where the data in user files are stored. See KB article 224.