[rogerbinns]

> btrfs does not even try to solve the problem I want zfs for; snapshots over the network.

This a recent Ubuntu system (ie not using development trees etc)

    $ btrfs send --help
    usage: btrfs send <command> <args>

        btrfs send [-v] [-i <subvol>] [-p <parent>] <subvol>
            Send the subvolume to stdout.

    $ btrfs receive --help
    usage: btrfs receive <command> <args>

        btrfs receive [-v] [-i <infile>] <mount>
            Receive subvolumes from stdin.

[lsc]

Ooh. thanks. this post is probably the most useful bit of information I've read this month. Hm. I will have to research more, but this might... change things significantly. I mean, it's still a newish feature, not something you want for backups, but between that an bcache, Linux looks like it might deserve another look, storage-wise.