Index Blocks

  
Figure 6: Index Blocks

• After first file access - the index block can be kept in memory
• Good for random access
• A whole index block at a time must be allocated even for small files
  large disk space overheads than for previous schemes
• Difficult to insert or delete blocks

an example of a unix directory structure (with symbolic link)

-rw-r--r--  1 ofr  1902 Sep  6  1995 Nn_Code
-rw-r--r--  1 ofr  1780 Jul  9  1996 PVM_vs_MPI
lrwxrwxrwx  1 root 27 Sep  6  1995 PetriNets -> /usr/local/petrinets/
drwxr-xr-x  2 ofr  512 Oct 26 14:52 Pmosaic