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Dell PowerFlex 4.5.x Administration Guide

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Removing resources from a resource group

You can remove resources that were previously added to a resource group.

Prerequisites

If you are removing a node that is fulfilling a Meta Data Manager (MDM) role, verify that you will have at least two MDMs and one tiebreaker in the cluster after the removal of the node. When you remove a node, PowerFlex Manager puts a standby node in place of the one that you removed. For a storage-only resource group, the platform minimum is four nodes in the cluster. This enables you to scale down to three nodes for a component replacement.

If the node has an NSX-T or NSX-V configuration, you can remove the node information that PowerFlex Manager displays for the resource group, but not delete the node from the resource group entirely. If the PowerFlex gateway used in the resource group is being updated on the Resources page, PowerFlex Manager does not enable you to remove resources from the resource group.

Steps

  1. On the menu bar, click Lifecycle > Resource Groups.
  2. Select a resource group from which you want to delete resources.
  3. In the right pane, click View Details.
  4. On the Resource Group Details page, in the right pane, under More Actions, click Remove Resource.
  5. In the Remove Resource dialog box, select the node that you want to remove and click Next.
  6. Select the Resource removal type:
    • Delete Resource makes configuration changes to the nodes, switch ports, virtual machine managers, and PowerFlex to unconfigure those components, and returns the components to the available inventory.
    • Remove Resource removes deployment information, but does not make any configuration changes to the nodes, switch ports, virtual machine managers, and PowerFlex, and returns the components to the available inventory.
  7. If you choose Remove Resource, perform the following steps:
    1. To keep the node in the inventory, select Leave resource in PowerFlex Manager inventory and set state to and select the state:
      • Managed
      • Unmanaged
      • Reserved
    2. To remove the node, select Remove resource from the PowerFlex Manager inventory.
    3. Click Remove.
  8. If you choose Delete Resource, perform the following steps:
    1. If you are certain that you want to proceed, type DELETE RESOURCE.
    2. Click Delete.

Results

When you delete a node from a resource group, PowerFlex Manager performs the following steps to clean up the underlying components associated with the node:
  1. Reconfigures the MDM cluster to ensure that the cluster is in good, working order. This step is necessary only if the node is part of an MDM cluster.

    If necessary, PowerFlex Manager reconfigures the MDM role for each node to be a manager or tiebreaker when you perform a scale down operation. PowerFlex Manager rebalances the roles as needed for a new resource group or for an existing resource group. PowerFlex Manager applies the required role changes for nodes that are within the same resource group or in a different resource group.

  2. If the node is on the list of SDSs, it removes the node from the list of SDSs within PowerFlex, The node might only be removed from the SDS list if the spare capacity is sufficient, and the environment provides enough space.
  3. Deletes the SVM for the node
  4. Deletes the virtual networking configuration
  5. Removes the host from vCenter (hyperconverged resource groups only)
  6. Removes the operating system on the node
  7. Removes the node from the SDC list within PowerFlex

When deleting a node for a hyperconverged resource group that has compression, PowerFlex Manager removes the DAX from the acceleration pool.

If you remove a node that is CloudLink enabled from a hyperconverged or storage-only resource group, PowerFlex Manager also performs these cleanup tasks:
  • Unencrypts the drives on the server.
  • Removes the machine from the machine group.
  • Removes IP addresses from approved networks.

PowerFlex Manager does not remove the machine groups or keystores. The machine groups and keystores can be reused for subsequent deployments.

After a node is deleted from a resource group, the Resource Group Details page shows the cluster without the removed node, and updates the MDM roles to reflect the new configuration.

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