prealloc(1) [hpux man page]

prealloc(1)						      General Commands Manual						       prealloc(1)

NAME

       prealloc - preallocate disk storage

SYNOPSIS

       name size

DESCRIPTION

       preallocates  at  least size bytes of disk space for an ordinary file name, creating the file if name does not already exist.  The space is
       allocated in an implementation-dependent fashion for fast sequential reads and writes of the file.

       fails and no disk space is allocated if name already exists and is not an ordinary file of zero length, if insufficient space  is  left	on
       disk, or if size exceeds the maximum file size or the file size limit of the process (see ulimit(2)).  The file is zero-filled.

DIAGNOSTICS

       returns one of the following values upon completion:

	      0       Successful completion.
	      1       name already exists and is not an ordinary file of zero length.
	      2       There is insufficient room on the disk.
	      3       size exceeds file size limits.

EXAMPLES

       The following example preallocates 50000 bytes for the file

WARNINGS

       Allocation of file space is highly dependent on current disk usage.  A successful return does not indicate how fragmented the file actually
       might be if the disk is approaching its capacity.

AUTHOR

       was developed by HP.

SEE ALSO

       prealloc(2), ulimit(2).

																       prealloc(1)

disktab(5)							File Formats Manual							disktab(5)

Name
       disktab - disk description file

Syntax
       #include <disktab.h>

Description
       The file is a simple data base that describes disk geometries and disk partition characteristics.  The format is patterned after the termi-
       nal data base.  Entries in consist of a number of fields separated by colons (:).  The first entry for each disk gives the names  that  are
       known for the disk, separated by vertical bars (|).  The last name given should be a long name fully identifying the disk.

       The following list indicates the normal values stored for each disk entry:
       Name Type Description
       ns   num  Number of sectors per track
       nt   num  Number of tracks per cylinder
       nc   num  Total number of cylinders on the disk
       ba   num  Block size for partition `a' (bytes)
       bd   num  Block size for partition `d' (bytes)
       be   num  Block size for partition `e' (bytes)
       bf   num  Block size for partition `f' (bytes)
       bg   num  Block size for partition `g' (bytes)
       bh   num  Block size for partition `h' (bytes)
       fa   num  Fragment size for partition `a' (bytes)
       fd   num  Fragment size for partition `d' (bytes)
       fe   num  Fragment size for partition `e' (bytes)
       ff   num  Fragment size for partition `f' (bytes)
       fg   num  Fragment size for partition `g' (bytes)
       fh   num  Fragment size for partition `h' (bytes)
       pa   num  Size of partition `a' in sectors
       pb   num  Size of partition `b' in sectors
       pc   num  Size of partition `c' in sectors
       pd   num  Size of partition `d' in sectors
       pe   num  Size of partition `e' in sectors
       pf   num  Size of partition `f' in sectors
       pg   num  Size of partition `g' in sectors
       ph   num  Size of partition `h' in sectors
       se   num  Sector size in bytes
       ty   str  Type of disk (e.g. removable, winchester)

       The entries can be automatically generated with the program.

Files
See Also
       chpt(8), newfs(8)

																	disktab(5)