On Mon, Jan 30, 2012 at 06:34:52PM -0200, Kelbel Junior wrote: > How you prefer to pre allocate space? > xfs I/O or by 'dd' to do it? > > What other information you would like to better understand and manage > to solve this problem? Do you expect to fill most of the file with data? In that case preallocating the file before starting I/O is the best way to do it.