See my answer in your other post  glen
How can I force a CX4 array to remove itself from a domain? The CX4 cannot reach the domain master due to a networking change.  Old network: 10.0.x.x New network: 10.42.42.x  > naviseccli -h 10.42.42.103 Domain -remove 10.0.42.103 -o Domain remove operation failed. The Master node is not reachable.  > naviseccli -h 10.42.42.103 Domain -add 10.42.42.103 -o Domain add operation failed. Error  10.42.42.103 is already participating in a domain.  > naviseccli -h 10.42.42.103 Domain -setmaster 10.42.42.103 -o Domain set master operation failed. The new master node is not participating in the current domain
CX4 Force domain removal?