* Jan Stary <[email protected]> [091125 04:18]: > Scenario: 4.5/i386, dumping filesystems as follows (via daily.local): > level 0 dump on Monday, level 1 dump on Tuesday, etc, level 6 dump on > Saturday. > Then level 0 again on Monday, and erase the old level>0 dumps. > > Now, I changed one of the dumped filesystems in the following way: > > > --- /var/backups/disklabel.sd0.current Mon May 25 08:14:43 2009 > > +++ /var/backups/disklabel.sd0 Wed Nov 25 08:10:09 2009 > > @@ -25,5 +25,4 @@ > > c: 625142448 0 unused > > d: 20980890 1060290 4.2BSD 2048 16384 1 > > e: 41945715 22041180 4.2BSD 2048 16384 1 > > - f: 251674290 63986895 4.2BSD 2048 16384 1 > > - g: 309476160 315661185 4.2BSD 2048 16384 1 > > + f: 561150450 63986895 4.2BSD 2048 16384 1 > > That is, what used to be two separate filesystems (sd0f and sd0g) > is now sd0f (one filesystem the size of the sum). I restored the > original content of sd0f on the (now bigger) sd0f partition from > a level 0 dump. (sd0g was moved elsewhere, and is sd1a now.) > > Now, when dumping /dev/sd0f during the next daily dump, > which happens to be a level 2 dump, the _whole_ filesystem > seems to get dumped (as if it were level 0). > > I just want to make sure this is to be expected: dump just dumps > everything that changed from the last lower-level dump, which happens > to be everything, _because_ the whole filesystem was re-created. > Right? I don't suppose "dump ; newfs ; restore" preserves inode > numbers for instance, so every single inode has 'changed', right? >
Yes, the behavior you're seeing is by design. > Is there something I can do (dumpdates?) to be able to "dump | restore" > and not 'break' the incremental dump cycle, or should I just schedule > any future "dump | restore" with my level 0 dump day? > No, I don't believe there is anything you can do to change this outcome. > Thanks for your time > > Jan > Take a look at http://www.openbsd.org/cgi-bin/cvsweb/src/sbin/dump/traverse.c and note how dump walks your filesystem and detects change. In particular, the mapfiles routine. HTH, jim
