FYI - On October 9th I integrated the fix for 2605 "want to resume
interrupted zfs send".  For more info, see:

 - slides http://www.slideshare.net/MatthewAhrens/openzfs-send-and-receive
 - video https://www.youtube.com/watch?v=iY44jPMvxog
 - manpage changes (for zfs resume -s and zfs send -t)
 - upcoming talk at the OpenZFS Developer Summit

The TL;DR is:

Use "zfs receive -s" to save the partially received state on failure.
On failure, get the receive token with "zfs get receive_resume_token <fs>"
Resume the send with "zfs send -t <token_value>"

Note that resuming send works correctly with size estimation, but does not
integrate with "zfs send -R" or "zfs send -I" (they don't know which
snapshots have been fully received).

--matt



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