Hi all, I did find only a single reference to the topic- but already some years ago.
So are there any implications someone need to take care of when using BackupPC pool on a BTRFS filesystem? Some features of BTRFS seems to be perfect for BackupPC but I am unsure if they have advantages. Deduplication feature: BackupPC hadrlinks identical files to save storage space which is already deduplication. But it uses hardlinks to do so- which frequently causes issues as you can see in this mailing list. So possibly diasble hardlinking in BackupPC (if possible) and let BTRFS do the work with deduplication? Disadvantage for BTRFS: it is only a "out-of-band" deduplication- so you have to perform the dupe detection by cron or so. Online-Compression: BTRFS uses online-compression- I am unsure if there would be an advantage if compression is done by filesystem. At least IMHO it would be easier to restore directly from the pool instead of cpool through bash? Pool-migration/ move: If you decide to move your pool to a different location you are happy if you have it on something like LVM (or completely virtualized). Then you can move the underlying device. Disadvantage: LVM and other tools move the full device. If the pool is just filled up to 70% it even transfers the 30% of empty space. With btrfs receive and btrfs send the filesystem will only transfer the used blocks. COW-Feature: With copy-on-write btrfs writes changed block on a different location and then refers to this new location. Has advantages for snapshots and so on. But disadvantages for larger files (like virtual disk images) as they spread among all devices which causes lots of seeks on rotating devices like HDDs. How about pool? Am I right this does not matter for backupPC as it always writes full files only? Even rsync-based backups? Besides of BackupPC someone havving experiences in using BTRFS? Thanks! Christian ------------------------------------------------------------------------------ Site24x7 APM Insight: Get Deep Visibility into Application Performance APM + Mobile APM + RUM: Monitor 3 App instances at just $35/Month Monitor end-to-end web transactions and take corrective actions now Troubleshoot faster and improve end-user experience. Signup Now! http://pubads.g.doubleclick.net/gampad/clk?id=272487151&iu=/4140 _______________________________________________ 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/
