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I believe the issue is that CSM loses communication with the Storage side and CSM marks the GM session as severe (copysets go Defiened in CSM only), however the GM session on the Storage side is still working and in Normal state. When communication is restored between CSM and the Storage hardware, the GM session still remains severe, even thou it is running correctly on the Storage.
Since CSM marked the session severe, to would be a good idea to have an option in CSM to "resync" the GM session to match the correct state reported on the Storage hardware, prior to the loss of communication.
With that said, we do have a discover command now for FC relationships. We could consider doing the same for remote copy relationships now as well.