zfs discuss - Aug 2010 - Snapshot size as reported by the USED property

I create snapshots on my datasets quite frequently. My understanding of the USED
property of a snapshot is that it indicates the amount of data that was written
to the dataset after the snapshot was taken. But now I''m seeing a
snapshot with USED == 0 where there was definitely write activity after it was
taken.

Is my understanding wrong or do I see a thing that is not supposed to happen? I
am on NCP3.

Thanks,
Peter
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