On Sat, Jan 28, 2006 at 01:17:27PM +0100, Paul Bijnens wrote: > > > Also dump can do incremential dumps. > > Does it do them filewise or just from > > the uninterpreted disk content? > > Actualy that is up to the dump program itself, > which I did not yet study in detail. > But I believe it does it filewise, also because > in most (all?) filesystem I know, there is > no information that indicates which blocks of > a file have changed. > > But I can imagine that filesystems would implement > that too, considering the immense size of the > current disks and filesystems... >
I guess it could be done in the "soon to be released" ZFS from Sun. That file system maintains a 128bit checksum on every block written for accuracy and error correction on reads. I could imagine a backup program using those data to identify changed blocks and only saving modified blocks. -- Jon H. LaBadie [EMAIL PROTECTED] JG Computing 4455 Province Line Road (609) 252-0159 Princeton, NJ 08540-4322 (609) 683-7220 (fax)
