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Lustre Manual section 37.4.2.1, Tuning File Read Ahead, describes both “max_read_ahead_mb” and “max_read_ahead_whole_mb” but there is no mention of “max_read_ahead_per_file_mb.”
It would be useful first to add a description of the effects of setting max_read_ahead_per_file_mb and then also to include its interactions with the other already-mentioned parameters. For example, it seems that the order of setting these parameters makes a difference in whether the values are accepted or rejected as "out of range."
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