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Experiences with zfs deduplication? (feddit.org)

submitted 2 days ago by [email protected] to c/selfhosted

16 comments fedilink hide all child comments

I recently moved my files to a new zfs-pool and used that chance to properly configure my datasets.

This led me to discovering zfs-deduplication.

As most of my storage is used by my jellyfin library (~7-8Tb), which is mostly uncompressed bluray rips I thought I might be able to save some storage using deduplication in addition to compression.

Has anyone here used that for similar files before? What was your experience with it?

I am not too worried about performance. The dataset in question is rarely changed. Basically only when I add more media every couple of months. I also have overshot my cpu-target when originally configuring my server so there is a lot of headroom there. I have 32Gb of ram which is not really fully utilized either (but I also would not mind upgrading to 64 too much).

My main concern is that I am unsure it is useful. I suspect just because of the amount of data and similarity in type there would statistically be a lot of block-level duplication but I could not find any real world data or experiences on that.

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[–] AbouBenAdhem 2 points 2 days ago* (last edited 1 day ago) (1 children)

I haven’t tried it because I’ve read a lot of negative discussions of it—and because (by my understanding) the only reasonable use case would be if there were a large number of users and each user is likely to have copies of the same files but don’t want to expose their files to each other (so you can't just manually de-dupe).