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I keep looking at it because ZFS deduplication is unusable for me. In every instance I've tried using it, it has resulted in kernel panics likely due to out of
by linsomniac 8y ago
I keep looking at it because ZFS deduplication is unusable for me. In every instance I've tried using it, it has resulted in kernel panics likely due to out of memory. My current backup server, where I'd really like to use it, would need something like $1,500 of RAM to support dedup, if I measure it correctly (because the simulation seems to only do active blocks, not snapshots, so I don't have a good idea of actual DDT RAM required).
- gigatexal 8y agoAhh yeah dedup is a ram hungry feature. I am hoping the devs find a way to fix that maybe with some novel use of data structures that make it less ram heavy. But it could be relate to the copy on write nature of ZFS and not be possible.
- hestefisk 8y agoDedup is indeed very memory hungry with ZFS. Likely cheaper / more cost effective to buy a bucket load of disk storage and extend your pool using raidz rather than adding ecc mem for ZFS.