Inside Solaris™ 9

Understanding Custom File System Parameters

Before you choose to alter the default file system parameters assigned by the newfs command, you need to understand them. This section describes each of these parameters:

• Logical block size

• Fragment size

• Minimum free space

• Rotational delay (gap)

• Optimization type

• Number of I-nodes and bytes per I-node

Logical Block Size

The logical block size is the size of the blocks that the UNIX kernel uses to read or write files. The logical block size is usually different from the physical block size (usually 512 bytes), which is the size of the smallest block that the disk controller can read or write.

You can specify the logical block size of the file system. After the file system is created, you cannot ...