Nothing worse than a vague question with little context, eh? Well... Does anyone know why GPFS might return ENOTTY to an fcntl(fd, F_SETLKW, &lock) where lock.l_type is set to F_RDLCK? The error prompting this question looks almost identical to the one in this (unfortunately unanswered) thread: http://www.spectrumscale.org/pipermail/gpfsug-discuss/2014-June/000412.html -Aaron -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://gpfsug.org/pipermail/gpfsug-discuss_gpfsug.org/attachments/20180821/e83498a3/attachment.html>