JFS file systems regularly.
Fragmentation means that files are scattered
haphazardly across a disk or disks, the result of growth over time.
Multiple disk-head movements are needed to read and update such files,
theoretically slowing response time.
In practice, though, a server is dealing with
many I/O requests at a time, and intelligence is designed into the
drivers to take account of the current head location and direction
when deciding on the next seek.
This means that defragmenting an HFS file system
on HP-UX may never be necessary; JFS file systems, however, do need
to be defragmented regularly.
See “Defragmenting an HFS File System” and “To defragment a JFS file system using fsadm ”.