 Dataset has a virtual layout 
 Number of mappings is 1
 Mapping 0 
         Selection in the virtual dataset Selection is H5S_ALL 
         Source filename as.h5
         Source dataset name /A
         Selection in the source dataset Selection is H5S_ALL 
 VDS Data:
 [   1   1   1   1   1   1]
 [   2   2   2   2   2   2]
 [   3   3   3   3   3   3]
 [   4   4   4   4   4   4]
