> Two questions from a newbie.
>        1/ What REFER mean in zfs list ?

The amount of data that is reachable from the file system root. It's
just what I would call the contents of the file system.

>        2/ How can I known the size of all snapshot size for a partition ?
>        (OK I can add zfs list -t snapshot)

zfs get usedbysnapshots <zfs-name>

Or if you have a recent enough system, have a look at the "written"
property: http://blog.delphix.com/matt/files/2011/11/oss.pdf (pg 8).
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