topolvm VS stratisd

I’m not aware of anything but you might want to look at the TopoLVM lvmd implementation. It’s a Kubernetes storage plugin for LVM and it talks to a interface daemon over gRPC so it might be useful inspiration at least.

there are local CSI-s like: https://github.com/topolvm/topolvm https://blog.min.io/introducing-directpv/

https://stratis-storage.github.io/

RedHat has Stratis - https://stratis-storage.github.io/ - that is their answer to ZFS. I haven’t used it yet but it looks good.

RHEL dropped support for BTRFS entirely, so that would be not an option if you want it. They stick to XFS/ext4 with a combination of mdraid, device mapper and lvm. They are working on Stratis to combine stable Linux tools https://stratis-storage.github.io/ mainly to provide similar capabilities like ZFS.

I use btrfs basically anywhere I can. I love subvolumes and using snapper. That said, I really don't see Red Hat paying any attention to btrfs in the near future. They've been working on Stratis and using VDO. It's kind of a weird mashing together of technologies to try to achieve the same features as BTRFS/ZFS. And of course like I said major storage deployments are using CEPH.

No, Red Hat invented Stratis to make XFS more like BTRFS/ZFS, but i don't know how much of it they achieved.

https://stratis-storage.github.io if you're interested. I was following it a lot before since ZFSonLinux wasn't in the best state, but once they merged that and FreeBSD into OpenZFS and I saw how slow the pace of Stratis was, I just kinda forgot about it.