Craig Barratt wrote at about 00:47:09 -0700 on Thursday, August 13, 2009: > Matthias writes: > > > Every day I get a message in __LOGDIR__/LOG: > > 2009-08-12 02:35:49 Cpool is 322.19GB, 1142028 files (860 repeated, 31 max > > chain, 11424 max links), 4369 directories > > > > What is the meaning of: > > repeated > > The total number of pool files with hash collisions. Since the hash is > not computed over the entire file contents, it's common to get files with > the same hash. > > > max chain > > The biggest set of pool files with the same hash. This is a potential > performance bottleneck if the number gets too large, since a incoming > file needs to be matched against every pool file in the chain. That > means each file is O(n), and n files from a full backup all with the > same hash takes O(n^2) comparisons. So it's a problem when this number > gets too big. >
Just as a reminder back to another thread regarding the advantages of storing the full md5sum in the envelope is that instead of O(n^2) byte-byte comparisons, one would only have to do O(n^2) md5sum comparisons or potentially none (or just a filesystem lookup which you have to do anyway) if the full file md5sum is used as the index. > > max links > > The maximum number of hardlinks on any pool file. The minimum is > 2 (anything with 1 is deleted since it is no longer used). This > means that across all your backups you have one file that appears > 11424 times. > > Craig > > ------------------------------------------------------------------------------ > 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 > BackupPC-users@lists.sourceforge.net > List: https://lists.sourceforge.net/lists/listinfo/backuppc-users > Wiki: http://backuppc.wiki.sourceforge.net > Project: http://backuppc.sourceforge.net/ > ------------------------------------------------------------------------------ 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 BackupPC-users@lists.sourceforge.net List: https://lists.sourceforge.net/lists/listinfo/backuppc-users Wiki: http://backuppc.wiki.sourceforge.net Project: http://backuppc.sourceforge.net/