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dcp: add --chunksize and --blocksize options
Add command-line options for --chunksize and --blocksize, and add them to the dcp.1 man page, since these options now exist for both dcp and dcp1. Improve the usage message for these options in dcp.1 to not be self-referential, and explain what they are actually used for. It was otherwise unclear what the difference between them was. Keep the default values at 1MB for now, but it probably makes sense to make them at least the Lustre stripe size to minimize contention between multiple threads reading/writing the same file. Signed-off-by: Andreas Dilger <firstname.lastname@example.org>
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