HP JFS 3.3 and HP OnLineJFS 3.3 VERITAS File System 3.3 System Administrator's Guide

Chapter 3 79
Extent Attributes
Commands Related to Extent Attributes
Commands Related to Extent Attributes
The VxFS commands for manipulating extent attributes are setext and
getext; they allow the user to set up files with a given set of extent
attributes or view any attributes that are already associated with a file.
See getext(1M) and setext(1M) for details on using these commands.
NOTE setext functionality is available only with the optional HP OnLineJFS
product.
The VxFS-specific commands vxdump and vxrestore, and the mv, cp,
and cpio commands, preserve extent attributes when backing up,
restoring, moving, or copying files.
Most of these commands include a command line option (-e) for
maintaining extent attributes on files. This option specifies dealing with
a VxFS file that has extent attribute information including reserved
space, a fixed extent size, and extent alignment. The extent attribute
information may be lost if the destination file system does not support
extent attributes, has a different block size than the source file system,
or lacks free extents appropriate to satisfy the extent attribute
requirements.
The -e option takes any of the following keywords as an argument:
The commands that move, copy, or archive files (mv, cp and cpio) use the
-e option with arguments of ignore, warn, or force.
For example, the mv command could be used with the -e option to
produce the following results:
• The ignore keyword loses any extent attributes for files.
• The warn keyword issues a warning if extent attributes for a file
cannot be preserved. Such a situation may take place if the file is
moved into a non-VxFS file system; the file would ultimately be
moved while the extent attributes would be lost.
warn Issues a warning message if extent attribute information cannot be
maintained (the default)
force Fails the copy if extent attribute information cannot be maintained
ignore Ignores extent attribute information entirely