Alex Ehrlich wrote: > Hello, > > Does anybody know is it possible to make Bacula detect file modification > (and hence the need of backup) only by the file hash value, ignoring > file modification datetime?
This is not possible without code modification. AFAIK. > The business problem is MS Outlook. This program has an option of moving > "old" mails to a separate storage file (usually archive.pst, you can > create lots of them with different names), and it could be good for > archiving. *But* every time you open the archive file for *viewing* > Outlook changes the file modification datetime (if you make the file > read-only Outlook will not open it at all). > Such "Outlook archive" files are often 1-10Gb in size and run into daily > backups without actually being changed. Adjusting Bacula seems a more > promising approach than adjusting MS ;-/. I currently have only 400Gb > for backup data and 10% of it is already used up in about 2 weeks with > just two clients actively using Outlook. > > If no such an option exists and it is not a very easy task to add then I > have to make a pretty specific backup plan for Outlook data... > > A side question on how Bacula calculates file hash values. Below goes > information on one archive.pst file, it shows hash values, too. > . > jobid type end time hash > 154 D 2008-08-31 03:18:07 KQfc/jt/2uvSth4TQsWyHOqr/2o > 148 I 2008-08-30 03:18:08 KQfc/jt2/uvSth4TQsWyHOqr/2o > 141 I 2008-08-29 03:18:25 vtWZTmFzsv3nzYEx+p4KEtzYVX0 > 134 I 2008-08-28 03:18:17 Qj1F4i+W3M6cHFapKmoiUFBGhiY > 127 I 2008-08-27 03:18:14 l68AAavutPtKrddMWZlGrnR+3bs > 120 I 2008-08-26 03:16:11 99cj5sVS95HfotnlkiwdskvThOY > 106 D 2008-08-24 03:18:21 /m2GsdZ80c2XQOZjpu2ku1jmESw > 99 I 2008-08-23 03:18:18 /m2GsdZ80c2XQOZjpu2ku1jmESw > 91 I 2008-08-22 03:18:59 ueo5zj7jDnuTTQAceSLWWRMrvT8 > 67 I 2008-08-19 03:18:25 tzlDSsAVXZ27F0LeC46ddz3GZjo > 46 D 2008-08-17 03:18:02 Le5jXuX5v2sTVW5oKwNmUXkpYvE > 38 I 2008-08-16 03:17:58 Le5jXuX5v2sTVW5oKwNmUXkpYvE > 29 I 2008-08-15 03:11:20 qsA4Mg8QICjs8CCVzTmBjyuZElk > 4 F 2008-08-12 18:30:13 lprr+TlhFseh3iSGsVVjj0lyD14 > . > You can see that every time a Differential backup is run the hash value > is the same as for the previous day's Incremental one. However, for each > Incremental backup the hash value is different. I cannot readily agree > that it is just a co-incidence and that the archive.pst did actually > change. So is there any more input to the hash function but the file > contents, and if yes then is there actually any good reason for it? > > Alex > > > > > > > ------------------------------------------------------------------------- > This SF.Net email is sponsored by the Moblin Your Move Developer's challenge > Build the coolest Linux based applications with Moblin SDK & win great prizes > Grand prize is a trip for two to an Open Source event anywhere in the world > http://moblin-contest.org/redirect.php?banner_id=100&url=/ > _______________________________________________ > Bacula-devel mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/bacula-devel -- Dan Langille BSDCan - The Technical BSD Conference : http://www.bsdcan.org/ PGCon - The PostgreSQL Conference: http://www.pgcon.org/ ------------------------------------------------------------------------- This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK & win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100&url=/ _______________________________________________ Bacula-devel mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/bacula-devel
