Now that you can snapmirror from 7-mode to cDOT, see vid below demonstrating it, it's one less hurdle:
http://netapp.tynsoe.org/wordpress/7-mode-cdot-screencat/
I have read that 8.2 7-mode is the last development release, all subsequent releases of 7-mode will be maintenance releases. This is further confirmed when you compare the 7-mode and cDOT release notes and see how many features are in cDOT and not 7-mode e.g NFS4, SMB3, QOS.
I also noticed that the next version (v6) of Oncommand Core (aka DFM) is cDOT only. A big issue for us is that cDOT doesn't have the concept of vFiler DR but I think there are more efficient ways of doing DR at the application level.
I don't think Netapp will need to discontinue 7-mode, as times goes on it will lack an increasing number of features and Customers will migrate to cDOT or another vendor.
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