Les Mikesell wrote at about 13:42:16 -0500 on Tuesday, September 1, 2009: > Jeffrey J. Kosowsky wrote: > > Les Mikesell wrote at about 12:15:34 -0500 on Tuesday, September 1, 2009: > > > Jeffrey J. Kosowsky wrote: > > > > > 2) you lose power/crash while expiring > > > > This would just mean that expiry not completed meaning that some > > > > expired files not deleted. Same problem occurs if power/crash during > > > > BackupPC_Nightly. The actual deletion is atomic. Just run expiry > > again. > > > > > > The actual deletion can't be atomic - you have to one thing in the > > > database and one thing in the filesystem. > > > > No. Expiry only involves deletions to the filesystem. i.e., you delete > > files that no longer are referenced in the database. No changes need > > to be made to the database. If something crashes, just start again. > > Will you enforce not running backups while you make this decision? > Otherwise you have a window between asking the database whether a > filename should be deleted or not and the time you remove the file. > Meanwhile a running backup could have just added another entry > referencing that filename.
This doesn't seem any harder than other multi-user/concurrent transaction database issues. If a filename is chosen to be deleted, then you don't allow adding that *same* filename back to the database until the delete has been confirmed. I really think this thread has run out of usefullness... you can continue to ask questions or pose challenges and I can continue to parry back standard database solutions. But we are way, way down in the weeds along a path that even I am willing admit doesn't have enough interest to merit actual development (at least at this point). In fact, I'm not even sure what we are arguing about since I never claimed that moving to a hybrid database/filesystem implementation would be easy and I never denied that you would have to re-address many of the fault cases that the current BackupPC implementation has been debugged against in addition to new database-specific issues. ------------------------------------------------------------------------------ Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day trial. Simplify your report design, integration and deployment - and focus on what you do best, core application coding. Discover what's new with Crystal Reports now. http://p.sf.net/sfu/bobj-july _______________________________________________ BackupPC-users mailing list BackupPC-users@lists.sourceforge.net List: https://lists.sourceforge.net/lists/listinfo/backuppc-users Wiki: http://backuppc.wiki.sourceforge.net Project: http://backuppc.sourceforge.net/
