Specifying the number of inodes
However, since fragment support optimizes disk utilization, it increases the number of small files and directories that can be stored within a file system.
Since each file or directory requires a disk inode, there needs to be a way to specify the number of inodes needed.
JFS allows the number of disk inodes created within a file system to be specified in case more or less than the default number of disk inodes is desired.
This number can be specified at file system creation as the number of bytes per inode (NBPI).
For example, an NBPI value of 1024 causes a disk inode to be created for every 1024 bytes of file system space.
A small NBPI value results in a large number of inodes and vice versa.