Hi, 07.07.2007 00:24,, Chris Morris wrote:: > Greetings! > > I am using amd and snapshot
Puh... I wouldn't do this (partly due to the problems you encounter). Simpler, IMO, is to set up a run before job that creates and mounts the snapshot, and a run after job that removes it. To be on the safe side, a daily or weekly removal of any stale snapshots might be reasonable. > in conjunction with bacula to ensure that > our servers back up cleanly due to installed databases. My problem > centers around a race issue in which I must guarantee that Bacula is > able to back up a snapshot directory before amd automatically unmounts > it. Details are as follows. > > We need to take a snapshot of the /usr and the /var filesystem. These > snapshots get stored in /snap, such that we end up with > /snap/var:autogen_bkup.0 and /snap/usr:autogen_bkup.0 once the snapshots > are taken. A frustrating detail turned up the fact that these are > mearly symlinks. The actual snapshot is stored in /.am/<server > name>/snap/var:autogen_bkup.0. (the same for usr:autogen_bkup.0) > > This is all fairly straightforward. We just set up the FileSet resource > to back up the /.am filesystem and everyone is happy. > > Except, there is that race condition. I said we were using amd with > this. It's set up in such a way that if we perform the snapshot and > then navigate to the /snap directory, there is nothing there. It's not > until you explicitly cd into /var:autogen_bkup.0 that amd mounts the > filesystem (symlink) for us. Once you explicitly cd into that > directory, amd will mount it for a time. Once the mount is left alone > for X minutes, amd does its thing and unmounts the volume. My first idea was to use a run before script that changes its working directory into these directories and simply sleeps until killed. Then, in a run after job script, kill the script. > My concern is that between the time the snapshot is created and the time > it takes bacula to get around to backing up that directory, the mount > will have disappeared. This brings me to my questions... > > Does anyone out there have a snapshot system running with Bacula? Well, the ones I know don't use automounting. > Does anyone have enough experience with amd to get me pointed in the > right direction? > > Also, a side question. I first tried to get bacula to backup from /snap > directory. (instead of /.am) As it turns out, bacula was only backing > up the symlink. Is there a way to get bacula to intelligently backup > symlinks? This *is* the intelligent behaviour IMO. If you want the "real" files, you've got to point Bacula to them. > This is my first post. If more information is needed to answer the > question, I will gladly supply it. I want to thank you in advance for > taking the time to help me with my problems. I only hope that some day > I can return the favor. Arno > Thank you, > > Chris Morris > -- Arno Lehmann IT-Service Lehmann www.its-lehmann.de ------------------------------------------------------------------------- This SF.net email is sponsored by DB2 Express Download DB2 Express C - the FREE version of DB2 express and take control of your XML. No limits. Just data. Click to get it now. http://sourceforge.net/powerbar/db2/ _______________________________________________ Bacula-users mailing list Bacula-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/bacula-users
