Hi Nicolas, I do not suspect any hardware failure (as this machine is running very fine), but will nevertheless carefully check it.
Thanks for the tip. Regards, Matthieu > From: [email protected] > To: [email protected] > Date: 17/11/2012 18:18 > Subject: Re: [rdiff-backup-users] Weird behavior of rdiff-backup : > founding diffs while there isn't > Sent by: [email protected] > > Hi Matthieu, > > I had only a quick read of your mail, but for me it smells hardware > problem. Have you cross-checked your cables, interfaces and storage medium? > > Regards, > Nicolas > > On 2012-11-16 11:21, [email protected] wrote: > > Hi all, > > > > I recently decided to choose rdiff-backup as backup tool on 2 Linux > > machines. > > > > One is running it perfectly. > > > > But the other one has a strange behavior when running rdiff-backup. > > Actually, it find differences in a lot of files while there isn't any. > > This leads to rdiff-backup overwriting a lot of files for nothing and > > taking a long time. > > > > Let me take an example to clarify things. > > > > Consider I already have 2 backups done on a daily basis (let me call them > > A and B chronologically -- thus B is the current mirror). > > > > I run 'rdiff-backup --compare' just before backing up : it returns "no > > changes" > > > > I run the back up and here rdiff-backup finds thousand of files that have > > changed (viewed from session statistics) !!! > > This backup is called C and is the new mirror. > > > > When I look at the file statistics, a lot of files are marked as changed. > > The first weird thing here is that IncrementSize is not null while > > SourceSize and MirrorSize are identical (IncrementSize is always a small > > number - <128 -). > > > > For example : home/USER/.kde/share/config/katerc 1 67 67 66 > > > > Ouch! > > Second weird thing is that absolutely no diff between C and B is stored > > nor in the data itself, nor in the metadata > > > > Now looking at the source files : their access times (and only these ones) > > have been updated at the time of the backup (thus rdiff-backup does > > something that changes this). > > Looking at the destination files : their access and change times have been > > updated also but not the modify time. > > > > Last very weird thing : if I run a rdiff-backup --compare-at-time 1B (thus > > comparing current files with old B backup), it returns "no changes" ... > > !!! > > > > At now my thinking is that rdiff-backup views a difference while there > > isn't when running in the backing up context but clearly see that there > > isn't in the comparing context. > > > > I also runned a rdiff-backup --compare every 5 minutes with a cronjob and > > it always return "no changes" except at the time where the backup started. > > Thus it seems that riff-backup is itself fooling itself... But not sure > > because if I run things manually (instead of cronjob), everything works > > fine. > > > > I don't know why I'm having this behavior at now but for sure I'd like to > > prevent it to appear. ;-) > > > > Did anyone already have this behavior ? And eventually found the cause and > > fix that ? > > > > As information, below the characteristics of the system (and between > > parenthesis the ones of the other machine when everything works well as > > comparison). > > > > - rdiff-backup version : 1.2.8 (1.2.8) > > - OS : Kubuntu 11.04 (Debian Wheezy) > > - kernel : 2.6.38 (3.2.0) > > - launching way : cronjob (cronjob) > > - source FS : ext4 (ext3) > > - destination FS : ext4 (ext4) > > > > So basically only noticeable difference is a quite old kernel on the > > screwing up machine. > > > > I will increase verbosity of rdiff-backup and keep you updated. > > > > In between, thanks in advance for any help and support. Feel free to ask > > if missing information can help. > > > > Best regards, > > Matthieu > > > > _______________________________________________ > > rdiff-backup-users mailing list at [email protected] > > https://lists.nongnu.org/mailman/listinfo/rdiff-backup-users > > Wiki URL: http://rdiff-backup.solutionsfirst.com.au/index.php/ > RdiffBackupWiki > > > > > _______________________________________________ > rdiff-backup-users mailing list at [email protected] > https://lists.nongnu.org/mailman/listinfo/rdiff-backup-users > Wiki URL: http://rdiff-backup.solutionsfirst.com.au/index.php/RdiffBackupWiki _______________________________________________ rdiff-backup-users mailing list at [email protected] https://lists.nongnu.org/mailman/listinfo/rdiff-backup-users Wiki URL: http://rdiff-backup.solutionsfirst.com.au/index.php/RdiffBackupWiki
