According to the result of DUMP, draw a very simple diagram in Word, 8 blocks in front of each data file, is LMT to manage Extent assignments. More detailed documentation can refer to the article about LMT and ASSM in the ITPUB E-Science Journal. Data file (LMT ASSM) (1 Block, block size is 8K)
FIRST LEVEL BITMAP BLOCK SECOND LEVEL BITMAP BLOCK PAGETABLE SEGMENT HEADER Data Block Data Block Data Block Data Block Data Block FIRST LEVEL BITMAP BLOCK SECOND LEVEL BITMAP BLOCK PAGETABLE SEGMENT HEADER Data Block Data Block Data Block Data Block Data Block FIRST LEVEL BITMAP BLOCK SECOND LEVEL BITMAP BLOCK PAGETABLE SEGMENT HEADER Data Block Data Block Data Block Data Block Data Block Data Block Data Block Data Block Data Block Data Block Data Block Data Block Data Block FIRST LEVEL BITMAP BLOCK Data Block Data Block Data Block Data Block Data Block Data Block Data Block
Data file (LMT) (1 block per grid, block size is 8K)
DATA SEGMENT HEADER - UNLIMITED Data Block Data Block Data Block Data Block Data Block Data Block Data Block DATA SEGMENT HEADER - UNLIMITED Data Block Data Block Data Block Data Block Data Block Data Block Data Block DATA SEGMENT HEADER - UNLIMITED Data Block Data Block Data Block Data Block Data Block Data Block Data Block Data Block Data Block Data Block Data Block Data Block Data Block Data Block Data Block Data Block Data Block Data Block Data Block Data Block Data Block Data Block Data Block
