On Wed, Feb 06, 2002 at 02:14:23PM -0600, Jack McKinney wrote: ... > If I add 512 bytes at the begining of the file, then I would expect > it. If I only add 14 bytes, then I don't think rsync will detect this, > as it would require it to compute checksums start at EVERY byte instead > of 512 byte checksums at offsets 0, 512, 1024, 1536, et al. > It is an easy experiment. Create a large text file (e.g., uuencode > a decently large binary) and rsync it to another machine and time it. > Then, edit it, and change ONE BYTE and rsync again. It should go much > faster because only one block has changed. Then, edit it a second time > and add a new line at the top that says Kilroy was here. This will add > 17 bytes to the file (13 letters, two spaces, one period, one newline). > Then rsync it again. I suspect that your xfer time will be comparable to > the first one, not to the second.
I did try it. Did you? It works. Look at the "speedup" printed by -v and the total bytes transferred. - Dave
