Dick Hoogendijk wrote:
> I overlooked something in the manual, I'm sure..
> But I have a question: when I create a snapshot of a zfs filesystem and 
> want to -return- to the state before that snapshot was taken, how do I 
> do that?


Gday Dick,
sounds like you're looking for   zfs rollback


      zfs rollback [-rRf] snapshot

          Roll back the given dataset to a previous snapshot. When
          a  dataset  is  rolled  back,  all data that has changed
          since the snapshot is discarded, and the dataset reverts
          to  the  state  at the time of the snapshot. By default,
          the command refuses to roll back  to  a  snapshot  other
          than  the most recent one. In order to do so, all inter-
          mediate snapshots must be destroyed by specifying the -r
          option.

          -r    Recursively destroy any snapshots more recent than
                the one specified.


          -R    Recursively destroy any more recent snapshots,  as
                well as any clones of those snapshots.


          -f    Used with the -R option to force an unmount of any
                clone file systems that are to be destroyed.



See zfs(1M).

cheers,
James
--
Senior Kernel Software Engineer, Solaris
Sun Microsystems
http://blogs.sun.com/jmcp       http://www.jmcp.homeunix.com/blog
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