Hello, Thanks for your reply.
Selon Jon Radel <[EMAIL PROTECTED]>: > Rémi Boulle wrote: > > For what I understood dirvish write only the changed parts of the > > changed files. > > While, if backing up across the network, rsync transfers only the > changed portions of changed files, what is written to disk is the entire > changed file. Ok, so dirvish "just" add the part sent by rsync with the unchanged part already on the hard drive ? > > My first image is roughly 5 Go, so why the second one is 5Go too ? (no > > files were changed) > > How did you measure this? Right click/properties ;-) (on ubuntu) >If you simply ran du against each image, then > yes, they would both show as 5 gig. However, if you run du against both > images at the same time, it should still show about 5 gig and not 10 > gig. So individually they use 5 gig each and globally they use 5gig + epsilon ? > Each image is equal, in the sense that no image is the "full > backup" and other images are the "differential backup." They're all > "full," some were just made earlier, but there is only one copy of each > unchanged, unmoved file physically taking up blocks on the hard drive. Ok, so eg the second image as a 5 gig space *reserved* on the filesystem (but not used). > This all assuming that you've not made any configuration errors, or run > dirvish with the --init option more than once, or changed critical > configuration choices between backups. It *is* possible to create > backups that have no link with each other. (Which many of us do > deliberately for extra safety. >From a disk space point of view it is totally equal no ? The only difference is from network load point of view... Am I right ? :-) Hum, so, is it possible to make differential backups everyday day and, once a month, a total backup (I mean with no link) ? > > Does it mean that all those images are "real" images ? eg I can delete > > last monday image without having any problems ? > > > > Unless you want to restore a file that was captured only in that backup. > :-) If you delete the last successful backup, you'll have to run > dirvish with the --init option again. Other than that, you can delete > any image without an issue. So the "mustn't to be touched" backups are the first one and the last one ? Thanks a lot. Things are getting clearer for me. Cheers. Rémi. > > --Jon Radel > _______________________________________________ Dirvish mailing list [email protected] http://www.dirvish.org/mailman/listinfo/dirvish
