MetroClusterに2つのノードを追加した際に生成されるDualControllerNonHa_Alert

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環境

Metrocluster IP
Metroclusterへの別のHAペアの追加（8ノードMCC-IP構成への増設）

問題

既存のMetroclusterに新しいHAペアを追加すると、アラートが発生しました

::*> system health alert show
        Node: Node-01
      Alert ID: DualControllerNonHa_Alert
      Resource: Shelf 3.10
Severity: Major
   Indication Time: Fri Nov 21 13:33:33 2025
      Suppress: false
     Acknowledge: false
   Probable Cause: Storage shelf 10 is connected to two controllers
           (Node-01, Node-02) that are not an HA pair.
   Possible Effect: Access to shelf 3.10 will be lost with a single
           controller failure.
Corrective Actions: 1. Halt all controllers that are connected to shelf 3.10.
           2. Connect shelf 3.10 to both HA controllers following the guide applicable to your shelf.
           3. Reboot the halted controllers.