# [OmniOS-discuss] snapshots on an exported pool

Johan Kragsterman johan.kragsterman at capvert.se
Wed Nov 6 19:43:43 UTC 2013

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    Thanks, Jim!

    I bet with myself that it would be you that answered this question! I won...

    I also got another question, but I send it in another mail with another subject, to make it easier to search the list.

    Rgrds Johan

    Till: omnios-discuss at lists.omniti.com
    Från: Jim Klimov
    Sänt av: "OmniOS-discuss"
    Datum: 2013.11.06 20:18
    Ärende: Re: [OmniOS-discuss] snapshots on an exported pool

    On 2013-11-06 19:07, Johan Kragsterman wrote:
    > Hi!
    >
    >   I've been thinking of what happens to a snapshot that have been sent to a zfs pool that later have been exported, and the original filesystem, on another pool, still changes.
    >
    > What happens with the snapshot(and the relation between the snap and the original) when the pool is re-imported?

    When you send a snapshot from your original pool, you have (logically)
    the same data named as the same snapshot in the other pool. If both
    snapshots continue to exist, you can send increments (from this snap
    to a next one defined in the future) to update a remote target. This
    requires that only one of the "live" datasets changes: changes on the
    target are discarded (rolled back) and the new increment is added on.
    However if you remove the original snapshot, you can't send increments
    anymore with ZFS means - you would have to replicate starting with an
    earlier common snapshot, or even with a full-sync from scratch. Also
    you can sync in such case with rsync - but would no longer be able to
    use zfs send for incremental sync...

    //Jim

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