It is pieced, 4 log cabin squares, obviously two rectangular, with sashing.
How do I get the pattern
Try either of these searches of the Craftsy patterns.
Log Cabin Cross Wallhanging-pdf pattern,
Karen Wood Craigie's Pattern Store.
Length of each piece
I suggest you purchase the pattern download, it is only $7.50. There 64 pieces with their own dimensions, not something I can list.
Log Cabin Cross Wallhanging-pdf pattern
Karen Wood Craigie's Pattern Store