Combining hdf5 files

Question

I have a number of hdf5 files, each of which have a single dataset. The datasets are too large to hold in RAM. I would like to combine these files into a single file contain

Answer 1

To update on this, with HDF5 version 1.10 comes a new feature that might be useful in this context called "Virtual Datasets".
Here you find a brief tutorial and some explanations: Virtual Datasets.
Here more complete and detailed explanations and documentation for the feature:
Virtual Datasets extra doc.
And here the merged pull request in h5py to include the virtual datatsets API into h5py:
h5py Virtual Datasets PR but I don't know if it's already available in the current h5py version or will come later.