On Mon, 16 Sep 2024, G.W. Haywood wrote: > > I tried 3 times to wipe and start from empty pool, but this comes > > back everytime. So there's a bug in BackupPC. It might only be > > triggered on ZFS (or maybe it's related to the speed on the > > underlying storage, as this one is really the fastest I ever > > used). But there's something. For the first time in more than 18 > > years of using BackupPC, > > I've been running BackupPC for nearly as long as you have, and I've > never seen such errors. But I run ext4. It would take an awful lot > of persuasion and years of testing for me to switch to anything else. > Last time I tried one of the latest and greatest new filesystems, the > whole thing went belly up in days. I vowed never to do that again. > > AFAICT so far, the best we can say is that the combination of BackuPC > and ZFS on Linux might be problematic. I can't say I'm surprised, but > I can say that we really don't yet know where your problem lies. So > far, I only know of two people running BackupPC on ZFS on Linux. [*] > Both have posted to Github issue 494. Unless there's some lurker here > who's keeping very quiet, in my view as I said above only you and that > other person are in a position in which they will be able to collect > evidence to identify BackupPC as the culprit. Evidence, not anecdote.
Backuppc user of >~ 20 years, moved from ext4 to XFS (lost data) to btrfs (lost data) to ZFS in ~2010-2012, moved it to a VM inside proxmox talking to the original raw disks in 2019/20, upgraded to V4 sometime around then. Have had the "missing pool file" error mentioned last comment in #494 (not "can't open pool file") whenever a client crashes halfway through a backup (like my desktop yesterday). Sometimes I've never found the culprit of what backup caused these messages, and since they can tally to the hundreds or thousands and pollute my logfile every day, I then rollback my backuppc pool a day or a few in ZFS to a point without any of these noisy backups, and they go away (Although there are 4 residual "missing pool file" messages in my daily log, where I never identified which backup they were coming from). Never had any other identiable corruption on ZFS though. *However*, ZFSonlinux has had *plenty* of sparse file related bugs to do with snapshots and similar. It was getting so bad at one point, I nearly stopped trusting the filesystem (my mind has been more at ease since I stopped having the time to follow mailing list discussions). I don't think backuppc is creating files with holes in them though. -- Tim Connors _______________________________________________ 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/
