Hi, Just to keep things updated here: --- Michael Mansour <micoots@xxxxxxxxx> wrote: > Hi, > > --- Ow Mun Heng <Ow.Mun.Heng@xxxxxxx> wrote: > On > Wed, 2004-05-26 at 11:42, David Maynard wrote: > > > I would suspect that some of the source files > are > > "sparse." Ie. there are > > > "holes" in the middle of them where space hasn't > > been allocated in the > > > source directory. Some applications that use > > random file access will create > > > sparse files. A simple copy operation that > > doesn't look for sparse files > > > will fill in the holes, causing the copy to take > > up more space than the > > > original. > > > > > > I haven't tried it (at least not recently), but > > rsync appears to have a > > > "--sparse" (-S) option. Try using that in > > addition to -av and see if that > > > changes the results. GNU tar has a similar > > option. > > > > Actually, if you're trying to copy all the files > > from A to B, where B is > > a Fresh directory, It's advisable to use GNU Tar. > > it'll speed up the > > transfer and it'll ensure that permissions are > kept > > as they should. > > > > After tha Rsync them for incremental backup etc. > > > > my 2 cents > > For the people following this sage here is the > result > of the rsync withOUT the -S option: > > /dev/md6 85419328 79678740 1401448 > 99% /data01 > /dev/hdf1 241263968 124262976 117000992 > 52% /data02 > > So the problem is sparse files. > > I wonder if tar takes this into account also? > > Michael. I did another: rsync -av -S /data01/ /data02 with the following result: /dev/md6 85419328 79678740 1401448 99% /data01 /dev/hdf1 241263968 79532584 161731384 33% /data02 Strange how I got such files to begin with, because on the original partition it's got 79Gb, I'm assuming with sparse files, and only when I perform the rsync (without the -S option) does it grow the sizes on the rsync. Not only do I wonder if tar will respond the same way as rsync without the -S option, but I'm also wondering if backup software which use rsync to perform backups would also take this into account... Michael. Find local movie times and trailers on Yahoo! Movies. http://au.movies.yahoo.com
