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Removing nodes from the cluster

You can remove unwanted nodes from the cluster. You can remove only one node at a time. After you remove a node, you must also remove its failover partner. Removing a node causes its data to become inaccessible or erased.

Before you begin

More than half of the nodes in the cluster must be healthy (indicated by cluster show).

All data on the node that you want to remove must have been evacuated.

About this task

Attention: Removing a node from the cluster (cluster unjoin) makes all system and user data from the disks that are connected to the node inaccessible to user access. After removing a node from the cluster, if you need to join the node back to the same cluster, you should contact technical support for assistance about restoring data.

Steps

  1. To remove a node from the cluster, use the advanced command cluster unjoin from another node in the cluster.
    The system informs you of the following:
    • You must also remove the node’s failover partner from the cluster.
    • After the node is removed and before it can rejoin a cluster, you must use boot menu option (4) Clean configuration and initialize all disks to erase the node’s configuration and initialize all disks.
    A failure message is generated if you have conditions that you must address before removing the node. For example, the message might indicate that the node has shared resources that you must remove or that the node is in a cluster HA configuration or storage failover configuration that you must disable.
  2. If a failure message indicates error conditions, address those conditions and rerun the cluster unjoin command.
    The node is automatically rebooted after it is successfully removed from the cluster.
  3. If the node is being repurposed, do the following after the node is rebooted:
    1. During the boot process, press Ctrl-C to display the boot menu when prompted to do so.
    2. Select boot menu option (4) Clean configuration and initialize all disks to erase the node’s configuration and initialize all disks.
  4. Repeat the preceding steps to remove the failover partner from the cluster.

After you finish

If you removed nodes in order to have a single-node cluster, you can modify the cluster ports to serve data traffic by modifying the cluster ports to be data ports, and creating data LIFs on the data ports.