There is no reason to be concerned. This is normal. Searching for "backuppc pool hashing chain" finds https://sourceforge.net/p/backuppc/mailman/message/20671583/ for example. The documentation could perhaps be more specific about this, but BackupPC "chains" hash collisions, so no data is lost or damaged. This is a pretty standard compsci data structure. If you search the BackupPC repository for the message you're seeing, you find https://github.com/backuppc/backuppc/blob/43c91d83d06b4af3760400365da62e1fd5ee584e/lib/BackupPC/Lang/en.pm#L311, which gives you a couple of variable names that you can use to search the codebase and satisfy your curiosity.
"165 repeated files with longest chain 1" just means that there are 165 different files that had a digest (hash) that matched another file. This can happen for a number of different reasons. A common one is that there are identical files on the backuppc client system that have different paths. I've been running BackupPC for a *long* time and have always had chained hashes in my server status. It's an informational message, not an error. On Tue, Mar 14, 2023, at 12:41 PM, Giannis Economou wrote: > The message appears in "Server Information" section, inside server > status, in the web interface of BackupPC (page "BackupPC Server Status"). > > Both servers are running BackupPC version 4.4.0. > 1st server says: "Pool hashing gives 165 repeated files with longest > chain 1" > 2nd server says: "Pool hashing gives 5 repeated files with longest chain 1" > > I could not find more info/details about this message in the documentation. > Only a comment in github is mentioning this message, and to my > understanding it is related to hash collisions in the pool. > > Since hash collisions might be worrying (in theory), my question is if > this is alarming and in that case if there is something that we can do > about it (for example actions to zero out any collisions if needed). > > > Thank you very much. _</email>_ Rob Sheldon Contract software developer, devops, security, technical lead _______________________________________________ BackupPC-users mailing list BackupPC-users@lists.sourceforge.net List: https://lists.sourceforge.net/lists/listinfo/backuppc-users Wiki: https://github.com/backuppc/backuppc/wiki Project: https://backuppc.github.io/backuppc/
