http://youtu.be/CFhyp209NHo - new (very short) demo, showing off pv integration ==> a REAL progress bar! (zfsync will fall back to my original hacky indicator, if you don't have pv available. which you should. go install that now. seriously.)
https://github.com/jrssystemsnet/zfsync - public github repo. Behold, 143 lines of hastily written Perl! Be kind, this is still very much "working beta" and there's a lot in the TODO.
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