[ ... ] >> Ok I completely agree what you said. So if I want to deallocate if any >> zeros then what is the procedure?
> man cp > In particular, the --sparse option That (and other programs like 'rsync' or GNU 'tar' that support sparse copying) is good if you can make a copy. If you want to allocate logical blocks full of zeroes, you must use a file system that implements so called "hole punching" 'ioctl's, and I can only remember (recent versions) of 'ext4', OCFS2 and (even fairly old versions) of XFS that do. There is a summary here: http://lwn.net/Articles/415889/ You must then write a program that scans the file and then issues the "hole punching" 'ioctl's in the places you want, as I think that there is no such ready-made program (but just checked and there is one at least for XFS). But it is really simple to write. _______________________________________________ rhelv5-list mailing list rhelv5-list@redhat.com https://www.redhat.com/mailman/listinfo/rhelv5-list
