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FWIW lvm can give you snapshots and other features. And mdadm can be used for a raid. All very robust tools.
Yes but BTRFS can this out of the box without extra tools. Both ways have their own advantage, but I would still prefer BTRFS
I'm in BTRFS, and wish I wasn't.
Booting into a failed mdadm RAID1 is normal,
whereas booting into a failed BTRFS RAID1 requires competent manual intervention, and special parameters given to the boot-kernel.
mdadm & lvm, with a fixed version of ZFS would be my preference.
ZFS recently had a bug discovered that was silently corrupting data, and I HOPE a fix has been got in.
Lemme see if I can find something on both of these points..
https://linuxnatives.net/2015/using-raid-btrfs-recovering-broken-disks
https://www.theregister.com/2023/11/27/openzfs_2_2_0_data_corruption/
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Never had problems, but I wish you all the best for your ZFS problem 🤗