Yes, you should be able to do that as long as you set dataset allocation to EARLY when creating datasets in serial mode (the default is not Early for the non-parallel case): https://www.hdfgroup.org/HDF5/doc/RM/RM_H5P.html#Property-SetAllocTime
While I don’t see any issues in the approach, this is not very well tested in HDF5 so if you find bugs please report to our Helpdesk. Thanks, Mohamad From: Hdf-forum <[email protected]> on behalf of Andrew Ho <[email protected]> Reply-To: hdf-forum <[email protected]> Date: Thursday, June 16, 2016 at 12:01 PM To: hdf-forum <[email protected]> Subject: Re: [Hdf-forum] Parallel HDF5 file locking error If I open up an H5 file with serial HDF5, can I write the metadata with one node (setup groups/attributes/datasets), and then later open up the H5 file from multiple nodes and only write actual data?
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