Holger Parplies wrote: > Hi, > > Marty wrote on 2009-08-31 19:58:58 -0400 [Re: [BackupPC-users] Problems with > hardlink-based backups...]: >> Peter Walter wrote: >> > [...] >> > If I had a method of simply backing up the changed files on the >> > backup server, and a method of dumping the hardlinks in such a manner >> > that they could be reconstituted later, then that would suffice. >> >> I have not followed this thread > > ... or other threads ... > >> so I may have missed somebody else making this point, > > ... or pointing out why it is wrong ...
Sorry, I should have scanned the archives. >> but recent versions of rsync have solved the memory hogging >> issue, > > Nope, they have not, and they can never. Yes, protocol level 30 behaves > better, but you still need a full list of all inodes with more than one link > and one path to that inode. At some point in file count (which has *nothing* > to do with pool size ... 220MB, 220GB or 220TB could potentially be the same > number of files) it will stop working. Before that point it will work. It will > likely get slower and slower as it approaches the point. But the point exists, > and will continue to do so, as long as there is no syscall > link (dev_t device, ino_t inode, char * newpath) ... > > Thinking about it, the rsync source structure is not confined to a single file > system, so rsync will actually need a (dev_t, ino_t) => path mapping. > > Before protocol level 30, rsync will likely run out of memory for the file > list long before the inode table becomes a problem, so, yes, protocol level 30 > is probably a big gain, but it still doesn't scale. Are you saying this is just an rsync problem, or an exponential scaling issue that no known algorithm can reduce to O(n)? > > I wish I would find the time to add that to the wiki. I for one would appreciate it. Thanks for the great software. > > Regards, > Holger > Marty ------------------------------------------------------------------------------ Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day trial. Simplify your report design, integration and deployment - and focus on what you do best, core application coding. Discover what's new with Crystal Reports now. http://p.sf.net/sfu/bobj-july _______________________________________________ BackupPC-users mailing list [email protected] List: https://lists.sourceforge.net/lists/listinfo/backuppc-users Wiki: http://backuppc.wiki.sourceforge.net Project: http://backuppc.sourceforge.net/
