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Recommend 32 instead of unlimited (-1; in practice ~160 on capstor, i.e. the number of OSTs) for large files.

Thanks to @mpasserini for the recommendation. This also the default stripe count amazon uses (https://docs.aws.amazon.com/fsx/latest/LustreGuide/performance.html#striping-pfl). NERSC recommend against using too many OSTs as well, but just say not to use more than 128 (https://docs.nersc.gov/performance/io/lustre/). NASA doesn't explicitly recommend a number, but uses 32 in their example (https://www.nas.nasa.gov/hecc/support/kb/lustre-progressive-file-layout-(pfl)-with-ssd-and-hdd-pools_680.html).

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preview available: https://docs.tds.cscs.ch/300

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