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A community for the ZFS filesystem.

ZFS is an opensource COW filesystem used by enterprise and serious homelabbers for it's data safety and extensive feature set.

OpenZFS is the active branch now developed primarily for Linux with a port to it's FreeBSD roots.

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ikidd@lemmy.world

Question regarding Metadata Special Device (lemmy.sdf.org)

submitted 6 days ago* (last edited 6 days ago) by SexualPolytope@lemmy.sdf.org to c/zfs@lemmy.world

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I currently have a zfs pool with mirrored vdevs, and it's working well. It only has HDDs. I was planning to add an SSD I have lying around as a Metadata Special Device, since I've read that it can improve performance by quite a bit. I've also read that if I do that, and if the special device dies, I lose my pool.

Now, I don't want to buy new SSD pairs for mirroring this one, so is there a way to ensure that the metadata is also stored on the HDD as usual, along with the SSD? I guess I want it to work like a cache for the metadata, and not the only place for it.

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[–] SexualPolytope@lemmy.sdf.org 1 points 6 days ago

Thanks for the reply. It seems I can't exactly do what I want here.