Changing HA cluster interface

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Changing HA cluster interface

Operating system
  1. Linux
  2. Windows
I have 2x RS2418RP+ in a cluster, but I want to change 1 Gbps LAN cluster interface to SFP 10 G port. The problem is that HA cluster interface checkbox on my existing LAN is greyed out.
How can I switch it to other LAN interface to be the main?
It's the connection to the switch.
So you say I have to erase everything and rebuild the cluster?
I don't have a cluster setup any more atm, but if I recall correctly that was the case, at least on DSM 6 at some point. Don't quote me on this, haven't done it more than a few times so I have no distinct memory of it.

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