UFS provides the tunefs tool which enables you to modify some pf the performance related parameters of a file system. The parameters that can be modified are:
The maximum number of logical blocks, belonging to one file, that is allocated contiguously. Contiguously allocated regions enable more data to be transferred in one I/O request. The value can be set to any positive integer number. The actual value will be the lesser of what has been specified and what the hardware supports.
The maximum number of contiguous logical blocks any single file can allocate from a cylinder group.
The minimum free space threshold, or the percentage of space held back from normal users.
For more information, see Customizing UFS File System Parameters and the tunefs(8) man page.