Re: [mbackup-devel] unix files and holes

[John H. <Jo...@mw...>]

Right!
 I'll check out the tar source to figure out how to do it..

Regards



> I think there is a way to find those holes because gnu tar can be smart
> and encode those holes in such a way that they don't use up tape. Try
> this:
> 
> [jokane@lal jokane]$ dd if=/dev/zero of=foo count=1 bs=1k seek=1000
> 1+0 records in
> 1+0 records out
> [jokane@lal jokane]$ ls -la foo 
> -rw-r--r--    1 jokane   505       1025024 Aug 22 15:09 foo
> [jokane@lal jokane]$ du foo 
> 8       foo
> [jokane@lal jokane]$ tar cf foo.tar --sparse foo 
> [jokane@lal jokane]$ ls -la foo.tar 
> -rw-r--r--    1 jokane   505         10240 Aug 22 15:10 foo.tar
> [jokane@lal jokane]$ du foo.tar 
> 12      foo.tar
> 
> cool right? :)
> 
> -james
> 
> 
>