Process command line options
Open the file outtmp.h5
Going to process dataset: /GROUP/DSET_BT2...
Open the dataset
Retrieve the dataset's layout
Dataset is a chunked dataset
Retrieve the dataset's chunk indexing type
Dataset's chunk indexing type is already version 1 B-tree: no further action
Close the dataset
Close the dataset creation property list
Processing the file's superblock...
Close the file