The VERITAS File System (VxFS) allocates disk space to files
in groups of one or more adjacent blocks called extents.
VxFS defines an application interface that allows programs to control
various aspects of the extent allocation for a given file (see “Extent Information”). The extent allocation
policies associated with a file are referred to as extent
attributes.
The VxFS getext and setext commands let you view or manipulate file extent attributes.
In addition, the vxdump, vxrestore, mv, cp, and cpio commands preserve extent attributes when a file is backed
up, moved, copied, or archived.
The following topics are covered in this chapter:
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