Greetings! I am using amd and snapshot 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 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? 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 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. Thank you, Chris Morris -- S i x F e e t U p | "Nowhere to go but open source" Silicon Valley: +1 (650) 401-8579 x609 Midwest: +1 (317) 861-5948 x609 Toll-Free: 1-866-SIX-FEET mailto:[EMAIL PROTECTED] http://www.sixfeetup.com | Zope/Plone Custom Development ------------------------------------------------------------------------- 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
