• The chuncking may be set for each variable after it is defined.
• The default chunking is the full dimension size for limited dimensions, and 1 for each unlimited dimension.
• Set the chunking with the nc_def_var_chunking function:

  
  /* Define chunking for a variable. This must be done after nc_def_var
     and before nc_enddef. */
  EXTERNL int
  nc_def_var_chunking(int ncid, int varid, int *chunkalgp, 
  		    int *chunksizesp, int *extend_incrementsp);
  
  /* Inq chunking stuff for a var. */
  EXTERNL int
  nc_inq_var_chunking(int ncid, int varid, int *chunkalgp, 
  		    int *chunksizesp, int *extend_incrementsp);
  
  

2007 Unidata NetCDF Workshop for Developers and Data Providers > Using NetCDF-4 Features, Part 1