setext (vxfs) - set extent attributes
/usr/sbin/setext [-F vxfs] [-e extent_size] [-f flag] [-r reservation]
setext specifies a fixed extent size for a file, and reserves space
for a file. The file must already exist.
-e extent_size Specify a fixed extent size. extent_size is the
number of file system blocks to allocate for the
extent. An extent_size of zero cancels previous
fixed-size extents for the file and uses the
default extent allocation policy. See
vxtunefs(1M) for information on extent size
-F vxfs Specify the VxFS file system type.
-f flags The available allocation flags are
Specify that all extents must be aligned on
extent_size boundaries relative to the start
of allocation units.
Immediately incorporate the reservation into
the file and update the file's on-disk inode
with size and block count information that is
increased to include the reserved space. The
space added to the file is not initialized.
Only users with appropriate privileges can
use the chgsize option.
Specify that the reservation must be
Specify that the file may not be extended
after the preallocated space is used.
Specify that the reservation is not a
persistent attribute of the file. Instead,
the space is allocated until the final close
of the file, when any space not used by the
Hewlett-Packard Company - 1 - HP-UX Release 11i: November 2000
file is freed. The temporary reservation is
not visible to the user (via getext(1M) or
the VX_GETEXT ioctl, for example).
trim Specify that the reservation is reduced to
the current file size after the last close by
all processes that have the file open.
-r reservation Preallocate space for file. reservation is
specified in file system blocks.
-V Echo the completed command line, but do not
execute the command. The command line is
generated by incorporating the user-specified
options and other information derived from
/etc/fstab. This option allows the user to verify
the command line.
setext is available only with the HP OnLineJFS product.
You can specify multiple flags by entering multiple instances of -f on
the command line.
You must specify the allocation flags with either the -e or -r option.
Only the align and noextend allocation flags are persistent attributes
of the file and therefore visible via getext(1M) or the VX_GETEXT
ioctl. Other allocation flags may have persistent effects, but are
not visible as allocation flags.
In some cases, fsadm may reorganize the extent map of a file in such a
way as to make it less contiguous. However, it will not change the
geometry of a file that has a fixed extent size.
getext(1M), fsadm_vxfs(1M), vxtunefs(1M), vxfsio(7) (particularly the
section on VX_SETEXT).
Hewlett-Packard Company - 2 - HP-UX Release 11i: November 2000