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Decommission connected grid nodes

Contributors netapp-perveilerk netapp-madkat ssantho3 netapp-lhalbert
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You can decommission and permanently remove nodes that are connected to the grid.

Before you begin

  • You understand the requirements and considerations for decommissioning grid nodes.

  • You have gathered all required materials.

  • You have ensured that no data repair jobs are active.

  • You have confirmed that Storage Node recovery is not in progress anywhere in the grid. If it is, wait until any Cassandra rebuild performed as part of the recovery is complete. You can then proceed with decommissioning.

  • You have ensured that other maintenance procedures will not be run while the node decommission procedure is running, unless the node decommission procedure is paused.

  • You have the provisioning passphrase.

  • Grid nodes are connected.

  • The Decommission Possible column for the node or nodes you want to decommission includes a green check mark.

    Note The decommission will not start if one or more volumes are offline (unmounted) or if they are online (mounted) but in an error state.
    Note If one or more volumes go offline while a decommission is in progress, the decommission process completes after these volumes have come back online.

  • All grid nodes have Normal (green) health green check mark icon. If you see one of these icons in the Health column, you must try to resolve the issue:

    Icon Color Severity

    yellow square icon

    Yellow

    Notice

    light orange diamond icon

    Light orange

    Minor

    dark orange diamond icon

    Dark orange

    Major

    red x icon

    Red

    Critical

  • If you previously decommissioned a disconnected Storage Node, the data repair jobs have all completed successfully. See Check data repair jobs.

Important Don't remove a grid node's virtual machine or other resources until instructed to do so in this procedure.
Steps

  1. From the Decommission Nodes page, select the checkbox for each grid node you want to decommission.

  2. Enter the provisioning passphrase.

    The Start Decommission button is enabled.

  3. Click Start Decommission.

  4. Review the list of nodes in the confirmation dialog, and click OK.

    The node decommission procedure starts, and the progress is displayed for each node. During the procedure, a new Recovery Package is generated to show the grid configuration change.

    screenshot of node decommissioning in progress
    Important Don't take a Storage Node offline after the decommission procedure has started. Changing the state might result in some content not being copied to other locations.

  5. As soon as the new Recovery Package is available, click the link or select MAINTENANCE > System > Recovery package to access the Recovery Package page. Then, download the .zip file.

    See the instructions for downloading the Recovery Package.

    Note Download the Recovery Package as soon as possible to ensure you can recover your grid if something goes wrong during the decommission procedure.

  6. Periodically monitor the Decommission Nodes page to ensure that all selected nodes are decommissioned successfully.

    Storage Nodes can take days or weeks to decommission. When all tasks are complete, the node selection list is redisplayed with a success message.

    screenshot showing that decommission is complete

  7. Follow the appropriate step for your platform. For example:

    • Linux: You might want to detach the volumes and delete the node configuration files you created during installation.

    • VMware: You might want to use the vCenter “Delete from Disk” option to delete the virtual machine. You might also need to delete any data disks that are independent of the virtual machine.

    • StorageGRID appliance: The appliance node automatically reverts to an undeployed state where you can access the StorageGRID Appliance Installer. You can power off the appliance or add it to another StorageGRID system.

Complete these steps after you complete the node decommission procedure:

  • Ensure that the drives of the decommissioned grid node are wiped clean. Use a commercially available data wiping tool or service to permanently and securely remove data from the drives.

  • If you decommissioned an appliance node and the data on the appliance was protected using node encryption, use the StorageGRID Appliance Installer to clear the key management server configuration (Clear KMS).You must clear the KMS configuration if you want to add the appliance to another grid. For instructions, see Monitor node encryption in maintenance mode.

Related information

Install Red Hat Enterprise Linux or CentOS