11-28-2013
And your question is ............?
Perhaps the space is used more efficiently when the files are restored. If the original files became fragmented with lots of partial disk blocks being written, then you could see a space used reduction after a restore as that would write full disk blocks and therefore use less of them.
Is this what you are after or have I missed the point? You made need to explain what you are seeing a little more.
Robin
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space(4) File Formats space(4)
NAME
space - disk space requirement file
DESCRIPTION
space is an ASCII file that gives information about disk space requirements for the target environment. The space file defines space needed
beyond what is used by objects defined in the prototype(4) file; for example, files which will be installed with the installf(1M) command.
The space file should define the maximum amount of additional space that a package will require.
The generic format of a line in this file is:
pathname blocks inodes
Definitions for the fields are as follows:
pathname Specify a directory name which may or may not be the mount point for a filesystem.
Names that do not begin with a slash ('/') indicate relocatable directories.
blocks Define the number of disk blocks required for installation of the files and directory entries contained in the pathname
(using a 512-byte block size).
inodes Define the number of inodes required for installation of the files and directory entries contained in the pathname.
EXAMPLES
Example 1: A sample file.
# extra space required by config data which is
# dynamically loaded onto the system
data 500 1
SEE ALSO
installf(1M), prototype(4)
Application Packaging Developer's Guide
SunOS 5.10 7 Feb 1997 space(4)