Any Ideas on how to determine what process has a ZFS snapshot resource busy

[dweimer]

I have a ZFS snapshot on one of my systems that was created Tuesday as 
part of its backup process, however it didn't delete as it was supposed 
to.  Attempts to destroy it return "cannot destroy snapshot ...: dataset 
is busy", I have confirmed that the backup process didn't hang, it 
completed successfully, all the other snapshots were destroyed.  I can't 
seem to find anything that shows something is currently accessing the 
snapshot.

Does anyone have any suggestions as to how to find out what process is 
accessing the snapshot preventing it from being destroyed?

-- 
Thanks,
    Dean E. Weimer
    http://www.dweimer.net/