Adding nodes to the cluster

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Expand an existing IBM Storage Ceph cluster by adding new IBM Storage Ready Nodes by using the IBM Storage Ceph Provisioner UI.

Before you begin

Before you begin, make sure that you have the following prerequisites in place:

  • The new IBM Storage Ready Nodes are physically installed, cabled, and connected to the provisioning and Ceph networks.
  • The nodes have been discovered by the Provisioner and appear in the Overview page with a status of Ready to install Ceph.
  • Static IP addresses for the Ceph public network are prepared for each new node.
  • If required, change the default root password on each Ready Node. Log in to each node by using SSH with the default credentials (username: root, password: ChangeMe123). You are prompted to set a new password the first time you log in.

About this task

The IBM Storage Ceph Provisioner manages cluster expansion by configuring the new nodes and adding them to the existing cluster. Depending on the Red Hat Enterprise Linux (RHEL) version that you selected during the Selecting the Ceph Version wizard, the Provisioner might upgrade the operating system on the new nodes before adding them to the cluster.

Procedure

  1. Open the Overview page in the IBM Storage Ceph Provisioner UI.
  2. In the Nodes table, select the new node and choose Actions > Add nodes to cluster.
  3. In the Add nodes dialog, review and update the node settings.

    Configure the following settings for each node:

    • Hostname — the node name to be used in the cluster
    • Static IP address — the IP address for the Ceph public network on this node
    • Bonding mode (Optional) — The network bonding mode for the Ceph public network interfaces. If you configure bonding, IBM recommends selecting the same bonding mode that you used during the initial cluster deployment to maintain a consistent network configuration.
    Note: To edit the hostname or static IP address, hover over the value in the dialog. An editable field appears on hover. This interaction is not visually indicated in the UI — hover over the value to reveal the edit option.
  4. Click Add nodes to begin the expansion.
  5. Monitor progress in the Status column of the Nodes table.

Results

The Provisioner configures the Ceph public network on the new nodes and adds them to the cluster. If applicable, the operating system is upgraded before the nodes are added. The node status updates automatically to show the progress.

What to do next

After nodes are added, validate cluster health. See Validating the installation.