also sprach Paul Slootman <[EMAIL PROTECTED]> [2006.03.19.1444 +0100]: > > It needs not use all metadata at all times. If I don't requiest > > e.g. permissions to be synchronised, it should not compare > > permissions. Or from a different angle: if two files are > > identical except for the permission bits, but my rsync call does > > *not* specify > > How is it to know that the two files are identical in that case?
How does it know they are identical in the forth run of rsync in the original post, after the permissions had been synchronised too? stat() structures can be equal for different files... > > Right. I know. The point is that rsync could be a little smarter > > at deciding when it actually has to use the rolling checksum. > > For instance, by checksumming the whole file first before > > rolling over it. > > You think the rolling checksum is less efficient than checksumming > the whole file? Perhaps, but I wonder whether it's measurable, It certainly takes longer. > especially given the fact that if there *is* a difference, it > needs to redo the checksum and IO the two files in question again > totally when it finds a difference. I'd like to see some analysis > of how inefficent the rolling checksum is... True. I have two huge directories with complex permissions. I always rsync from one to the other. Previously, I used to set the permissions on the source before rsync'ing with -a. Whenever I forgot to set the permissions locally, things would screw up. Therefore, we set umasks and setgid correctly all over the target tree, and use -r now for the synchronisation. But this takes almost half an hour even if the source hasn't changed since the last sync. It used to take less than a minute when we used -a. -- .''`. martin f. krafft <[EMAIL PROTECTED]> : :' : proud Debian developer and author: http://debiansystem.info `. `'` `- Debian - when you have better things to do than fixing a system Invalid/expired PGP (sub)keys? Use subkeys.pgp.net as keyserver! "si tu veux construire un bateau, il ne faut pas réunir des hommes pour aller chercher le bois et les outils et les préparer à se répartir les différents travaux. Il faut plutôt leur donner l'envie, la passion de la mer infinie." -- antoine de saint-exupéry
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