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Modifiable snapshots are called clones in ZFS. Everything you said about snapshots is possible with ZFS with clones+snapshots. Clones are just as instant as sna

Modifiable snapshots are called clones in ZFS. Everything you said about snapshots is possible with ZFS with clones+snapshots. Clones are just as instant as snapshots. Runnin ZFS in linux is not good idea. That's why I'm currently using OpenSolars and maybe switching to FreeBSD in the future for file and db servers. The problem with btrfs time estimate is that it takes long time for filesystems to become reliable enough that you can put important data on them. ZFS has crossed that threshold, it takes years and years for btrfs.

xioxox 13y ago
ZFS doesn't support an arbitrary graph of snapshots, even with cloning. There is a "zfs promote" command that can be used, but can only be used in certain circumstances. For example, I wanted to take the latest backup of a system and rsync older and older backups onto that backup, making a snapshot each time. I then wanted the snapshot of the newest data to be the "HEAD". I also wanted to gradually delete the older data. This setup was not possible with ZFS, because the child-parent relationships were in the wrong order. With btrfs it was simple.