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Adding a Node to an Existing Qumulo Cluster


This article explains how you can add a new Arrow, HPE, or Supermicro node to an existing Qumulo on-premises cluster.

Important: From August 2021, we removed all Qumulo-specific branding (such as stickers, bezels, and faceplates) from all Server Q nodes:

  • C-72T, C-168T, C-192T, C-432T
  • K-144T, K-168T, K-432T
  • P-23T, P-92T, P-184T, P-368T
  • QC24, QC40 (Gen 1, Gen 2), QC104, QC208, QC260, QC360

If you purchased a Server Q node after August 2021, you might notice differences in branding appearance. This change doesn't impact node functionality in any way.


  • An existing cluster that runs Qumulo Core
  • New nodes
  • Completion of the following checks:
    • Sufficient Number of Static IP Addresses: The number of IP addresses must be equal to or greater than the number of nodes that you plan to have in your cluster. If you don't have enough static IP addresses, you won't be able to add a new node to your cluster. For more information about working with IP addresses, see IP Failover with Qumulo Core.
    • Correct Version of Qumulo Core on New Nodes: Ensure that the version of Qumulo Core on your new nodes matches the version that currently runs on your cluster. To upgrade Qumulo Core on your new node, see Perform a Clean Installation of Qumulo Core.

For more information, see Performing Qumulo Core Upgrades by Using the Web UI or contact Qumulo Care.


After you install, rack, network, and power on your nodes, Qumulo Core discovers any new, unconfigured nodes automatically and prompts you to add nodes in the Web UI.

Note: If Qumulo Core doesn't discover any unconfigured nodes, it displays the message No unconfigured nodes found. If you expect to see nodes, contact Qumulo Care.

Step 1: Resolving Drive Compatibility Issues

If your existing version of Qumulo Core predates any newer, Qumulo-certified drives that you received with your new node, you can't install an older version of Qumulo Core on the new node.

Important: If you try to do this, the Installation failed message appears, explaining how you can use cluster logs to identify any incompatible drives.

To resolve drive compatibility issues, you can use one of the following processes:

  • To receive support for new, Qumulo-certified drives, you can upgrade your existing cluster to the latest version of Qumulo Core and then install the same version of Qumulo Core on your new node. For more information, see Performing Qumulo Core Upgrades by Using the Web UI.
  • To receive support for new, Qumulo-certified drives without upgrading Qumulo Core, you must update the Supported Drive List on your new node by contacting Qumulo Care and letting our agent connect remotely to your cluster.

Step 2: Adding Your New Node to an Existing Qumulo Cluster

  1. Log in to the Web UI.
  2. Click Cluster > Add Nodes.
  3. On the Add Nodes page, select the unconfigured nodes that you want to add to your cluster.
  4. Click Add Selected Nodes to Cluster.
  5. In the Add <N> nodes to cluster <name>? dialog box, click Yes.
    If you add one or more node model types, a message reminds you that Qumulo Core will add a new model type to your cluster.

Qumulo Core configures your node and adds it to your cluster. On the Cluster page, the Web UI shows the banner Successfully added <N> nodes to the cluster and the total available storage.


  • After you add a new node to your cluster, Qumulo Core might take a short while to update the total available storage.
  • When you add a new node to a cluster, existing nodes retain their numbering.


Increasing the Node-Fault-Tolerance Level for Your Cluster During Node-Add Operations

Qumulo Quick Start Guides

IP Failover with Qumulo Core

Qumulo Core Upgrades via Web UI 

Perform a Clean Install of Qumulo Core

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