we just moved our storage services from FAS3240 dual Chassis HA (7-Mode) to FAS8200 dual Chassis HA (cDot). Now we want to migrate the "old" FAS3240 7-Mode back to a single chassis HA. In the past the dual chassis FAS3240 used "external" onboard 10GB SFPs for cluster interconnect (Port c0a and c0b). Now we moved the second controller into the chassis of the first controller and disconnect the "external" cluster interconnect cables, because the cluster pair should use the internal Infiniband interconnect on the backplane.
Unfortunaltely the cluster still wants to use the ports c0a and c0b for cluster interconnect. Due to the reasons that we unplug the "external" cables, Ontap told us:
Link 0: down IC RDMA connection : down
If we enable cf the messages appaers:
Filer-B is up, takeover disabled because of reason (interconnect error) Filer-A has disabled takeover by Filer-B (interconnect error) RDMA Interconnect is down (Link 0 down).
How to tell Ontap to use internal Infiniband IC's insetad of "externel" cluster ports c0a and c0b?
thanks for your help. The psm-cc-config setting were already set, because it was an HA pair before as well (just a dual chassis cluster pair).
It's fixed now by rebooting the first node again... finally after the second reboot the controller started up the RDMA Link 0 interconnect and cf is running well. No more interconnect errors. Failover is working as well.