> Now, while its understandable that the destination file is locked for one of > the "cat", so have to wait
If GPFS is posix compatible i do not understand why a cat should block the other cat completly meanings on a standard FS you can "cat" from many source to the same target. Of course the result is not predictable. >From this point of view i would expect that both "cat" would start writing immediately thus i would expect a GPFS bug. All imho. Hajo Note: You might test which the input_file in a different directory and i would test the behaviour if the output_file is on a local FS like /tmp.
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