On 02/ 7/10 12:57 PM, Thomas Burgess wrote:
I just started using send/receive myself yesterday.

This is what i found out

I wanted to do the same thing, i had a filesystem called Video in my tank pool, it looked like this:

tank/nas/Video (pool was tank, it was a child of nas) and it was mounted at /tank/nas/Video

I tried to send it to tank/test/Video

so i made a snapshot
zfs snapshot tank/nas/vi...@base

then i created a new filesystem with compression:
zfs create tank/test
zfs create tank/test/Video
zfs compression=on tank/test/Video
then i tried to send it

zfs send tank/nas/vi...@base | zfs receive tank/test/Video

and i got the same error. what i found out was, i needed to drop the "Video" part and do it like this:

zfs destroy tank/test/Video

then turn on compression on the CHILD like this:
zfs set compression=on tank/test
then send it like this:

zfs send tank/nas/vi...@base | zfs receive tank/test/Video

This did what i needed....i hope this helps


On Sun, Feb 7, 2010 at 6:48 AM, Bruno Damour <br...@ruomad.net <mailto:br...@ruomad.net>> wrote:

    Hello,
    I'm trying to migrate my "data" pool to get dedup and compression.
    I tried :
    # zfs send -RD d...@prededup |zfs receive ezdata/data
    it fails in the end with :
    cannot receive new filesystem stream: destination 'ezdata/data' exists
    must specify -F to overwrite it
    the ezdata pool has just been (re)created and is completely empty
    Now even with that message it has anyway created a "data" fs on
    the new pool and copied 151G of data, which might well be the
    whole data filesystem, but none of the other fs that were on the
    same pool, ie data/archive, data/archive/scanrisk,
    data/postgres84_64, data/cyrus23, and their snapshots have not
    been copied.
    What is the exact signification of this message and what should I do ?
    Thanks in advance
    bruno
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Well, your solution was what I tried in the first place, so it won't work for me.
I think somehow the problem is linked to child datasets
It does copy the parent (data) but stops after that.
I thnk the message is unaccurate as it creates the data fs... itself
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