index node size exceeds free space on page - fragmentation

  Explanation:  You specified a node size which exceeds  the  free
  space  on  pages  in one of the storage areas.  The node will be
  fragmented and result in more I/O than necessary.

  User Action:  This is just a warning.  If  you  size  the  index
  node  to  better  fix  the page, or size the page for this index
  node size you may improve I/O performance when using this index.