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Shutting down the controller

To shut down the degraded controller, you must determine the status of the node and, if necessary, take over the node so that the healthy node continues to serve data from the degraded controller storage.

Before you begin

  • If you have a cluster with more than two controllers, check the health and Epsilon from advanced mode: cluster show -epsilon*

  • If the cluster is not in quorum or a controller that is not the degraded controller shows false for eligibility and health, correct the issue before proceeding to the next step.

  • If Epsilon resides in the degraded controller:

    1. Remove Epsilon from the degraded controller: cluster modify -node degraded_node -epsilon false

    2. Assign Epsilon to a healthy controller in the cluster: cluster modify -node healthy_node -epsilon true

About this task

You might want to erase the contents of your caching module before replacing it.

  1. Although data on the caching module is encrypted, you might want to erase any data from the impaired caching module and verify that the caching module has no data:
    1. Erase the data on the module: system node flash-cache secure-erase run
    2. Verify that the data has been erased from the module: system node flash-cache secure- erase show -node node_name

      The output should display the caching module status as erased.

  2. If the degraded controller is part of an HA pair, disable automatic giveback from the console of the healthy controller using the following command: storage failover modify -node local -auto-giveback false
  3. Take the degraded controller to the Autoboot Loader prompt by typing storage failover takeover <impaired node name> from the RJ45 management port of the degraded controller.
    If the degraded controller is displaying...Then...
    The LOADER promptGo to the next step.
    Waiting for giveback...

    Press Ctrl-C, and then respond y when prompted.

    System prompt or password promptTake over or halt the degraded controller:
    • Take over the degraded controller from the healthy controller: storage failover takeover -ofnode impaired_node_name

      When the degraded controller shows Waiting for giveback..., press Ctrl-C, and then respond y.