I'm letting ZFS do the compression (using the default of LZ4) with BackupPC handling deduplication. I think you'll find a reasonable consensus that ZFS compression is always a win for storage space (it will store un-compressible data unmodified), whereas ZFS deduplication is best avoided in most cases, mostly due to its high memory usage. It's possible that BackupPC compression would be tighter than LZ4, but I'm not short of storage space for BackupPC so I haven't compared the two. One frequently overlooked benefit of enabling ZFS compression is that, when enabled, regardless of scheme, it leaves all-zero blocks unallocated.
Robert Trevellyan On Tue, Sep 10, 2019 at 10:50 PM Carl Soderstrom < carl.soderst...@real-time.com> wrote: > Thanks for the advice. Anyone else care to share their experience? > > On 09/10 02:57 , Ray Frush wrote: > > We backup to a ZFS based appliance, and we allow ZFS to do compression > and disable compression in BackupPC. We do not allow ZFS to de-duplicate. > However since you’re looking at doing ZFS on the same box that’s running > BackupPC it probably doesn’t matter which one you have compression turned > on since it’s the same processors., just don’t do both. > > > > > > > > > > > > > On Sep 10, 2019, at 12:26, Carl Soderstrom < > carl.soderst...@real-time.com> wrote: > > > > > > We've been a BackupPC v3 shop since there's been a v3 and we're > looking at > > > building our first v4 BackupPC server. The boss wants to put it on ZFS > and a > > > JBOD controller. > > > > > > I believe that for BackupPC v3 the advice was to turn off ZFS > > > filesystem-level deduplication and compression. > > > > > > Is that still true for BackupPC v4? > > > Are there any other suggestions for filesystem settings for ZFS when > hosting > > > a BackupPC pool? > > > > > > -- > > > Carl Soderstrom > > > Systems Administrator > > > Real-Time Enterprises > > > www.real-time.com > > > > > > > > > _______________________________________________ > > > 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/ > > > > > > > > _______________________________________________ > > 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/ > > -- > Carl Soderstrom > Systems Administrator > Real-Time Enterprises > www.real-time.com > > _______________________________________________ > 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/ >
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