The timestamps in snapshots can change due to the way mtime updates work, but the contents of a snapshot should not change. So the issue comes down to the directory rename operation you did, which definitely should NOT show up in a prior snapshot. Nor should any other additions or deletions. I was not able to reproduce the rename / add / delete issues you reported.
It might be due to how you are accessing the snapshot. You are providing a path, such as "/var/hammer/home/andrea/snap-20170406-0957/bin/ ...", but what is 'snap-20170406-0957' ? Is it a softlink to something? Is it a mount? Try CD'ing into the snapshot using the TID snapshot format. That is, do a 'hammer snapls' to list available snapshots, then CD into one of them using cd .@@0x<fullsnapshottid>. Then go from there. -Matt On Fri, Apr 7, 2017 at 4:21 AM, Andrea <[email protected]> wrote: > Hi, with help form this list I've set-up my main main workstation and > almost ported all my work to DragonFly BSD (thanks!) > > Now I'm moving all my data and but I'm left with one problem I'm not able > to sort out: some of the changes to files are propagated in older > snapshots! It's obviously impossible so or I've done something horribly > wrong during disk set-up or I don't understand how snapshots works. > > The "short" version: > > 1) /home/andrea/ is my home directory in a master PFS > 2) /home/attic/ is another directory in another master PFS > 3) Both PFSs have a snapshot done yesterday. > 4) If I add or remove files sometimes changes are not visible in > yesterday's snapshots, but sometimes they are. > > As an example, today I've added (added, not modified) this file: > % ls -l /home/attic/disk_stats.txt > -rw-r--r-- 1 andrea wheel 167 Apr 7 11:38 /home/attic/disk_stats.txt > > And I found it in yesterday's snapshot: > % ls -l /var/hammer/home/attic/snap-20170406-0957/disk_stats.txt > -rw-r--r-- 1 andrea wheel 167 Apr 7 11:37 > /var/hammer/home/attic/snap-20170406-0957/disk_stats.txt > > File date in the snapshot is 1 minute earlier than original but the file > shouldn't be there at all. > > 5) Another example: today I moved a whole directory from /home/attic/ to > /home/andrea/ and: > - It disappeared from /home/attic/ yesterday's snapshot > - It appeared in /home/andrea/ yesterday's snapshot > - Files in /home/andrea/ kept the last modify dates while files in the > snapshot have the date of the moment I moved the directory > > 6) I'm 100% sure I didn't move file directly inside the snapshot directory > > > Some details: > > 1) OS version is DragonFly v4.8.0-RELEASE #4 > 2) Both directories /home/andrea/ and /home/attic/ are mirrored on a > second disk. > 3) This is the output of snapls and pfs-status for /home/andrea/: > > # hammer snapls /home/andrea/ > Snapshots on /home/andrea/ PFS#1 > Transaction ID Timestamp Note > 0x0000000000000000 2017-04-06 09:57:34 CEST - > > # hammer pfs-status /home/andrea/ > /home/andrea/ PFS#1 { > sync-beg-tid=0x0000000000000001 > sync-end-tid=0x00000001183f03c0 > shared-uuid=f030302c-1895-11e7-b1dd-714d7b6e28cc > unique-uuid=f0303031-1895-11e7-b1dd-714d7b6e28cc > label="" > prune-min=00:00:00 > operating as a MASTER > snapshots directory defaults to /var/hammer/<pfs> > } > > 4) Here I find my snapshot for /home/andrea/: > > # ls -l /var/hammer/home/andrea/snap-20170406-0957 > lrwxr-xr-x 1 root wheel 33 Apr 6 09:57 > /var/hammer/home/andrea/snap-20170406-0957 > -> /home/andrea/@@0x0000000000000000 > > 5) The output of snapls and pfs-status for /home/attic/: > > % hammer snapls /home/attic/ > Snapshots on /home/attic/ PFS#2 > Transaction ID Timestamp Note > 0x0000000000000000 2017-04-06 09:57:34 CEST - > > % hammer pfs-status /home/attic/ > /home/attic/ PFS#2 { > sync-beg-tid=0x0000000000000001 > sync-end-tid=0x000000011840a4b0 > shared-uuid=7bb3b3bc-18ab-11e7-9d0e-714d7b6e28cc > unique-uuid=7bb3b3e1-18ab-11e7-9d0e-714d7b6e28cc > label="" > prune-min=00:00:00 > operating as a MASTER > snapshots directory defaults to /var/hammer/<pfs> > } > > 6) Here I find my snapshot for /home/attic: > > % ls -l /var/hammer/home/attic/snap-20170406-0957 > lrwxr-xr-x 1 root wheel 32 Apr 6 09:57 > /var/hammer/home/attic/snap-20170406-0957 > -> /home/attic/@@0x0000000000000000 > > 7) I try to reproduce the problem but everything seems ok: > > I delete a file in my home directory and I still find it in the snapshot: > > $ rm /home/andrea/0 > $ ls /home/andrea/0 /var/hammer/home/andrea/snap-20170406-0957/0 > ls: /home/andrea/0: No such file or directory > /var/hammer/home/andrea/snap-20170406-0957/0 > > Now I add a file in my home directory and I don't find it in yesterday's > snapshot: > > $ touch xxx > $ ls -1 /home/andrea/xxx /var/hammer/home/andrea/snap-20170406-0957/xxx > ls: /var/hammer/home/andrea/snap-20170406-0957/xxx: No such file or > directory > /home/andrea/xxx > > 8) But, I moved a directory in my home directory *today* and I find it in > *yesterday's* snapshot: > > % ls -l /home/andrea/bin/ | grep launcher > -rwxr-xr-x 1 andrea wheel 57 Jun 11 2013 ll.urxvt_launcher > > % ls -l /var/hammer/home/andrea/snap-20170406-0957/bin/ | grep launcher > -rwxr-xr-x 1 andrea wheel 57 Apr 7 11:42 ll.urxvt_launcher > > In other words: today I added the whole /bin directory inside my home and > I find it in yesterday's snapshot. Files in my home directory have the > original dates (2013 in this case) while version in the snapshot have the > date of the moment I added the files. As you can see from the output above > there's a file dated 2017-04-07 inside the snapshot dated 2017-04-06 which > should be impossible > > 9) In the source directory the directory disappeared from yesterday's > snapshots. > > 10) I didn't mess with the snapshot directories directly (I double checked > my command history to be sure). > > > I'm completely lost here, any suggestion about what I'm doing wrong or > what I can do to diagnose further? > > > Regards, > Andrea >
