6. Adding Nodes
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6. Adding Nodes

To add new nodes to the cluster, please proceed as follows:

  1. Install the adapter in the nodes to be added and power the nodes up.

    Important

    Do not yet connect the Interconnect cables, but make sure that Ethernet communication towards the frontend is working.

  2. Install the DIS software stack on all nodes via the --install-node option of the SIA.

  3. Change the cluster configuration using dishostseditor:

    1. Load the existing configuration.

    2. In the cluster settings, change the topology to match the topology with all new nodes added.

    3. Change the hostnames of the newly added nodes via the node settings of each node. Also make sure that the socket configuration matches those of the existing nodes.

    4. Save the new cluster configuration. If desired, create and save or print the cabling instructions for the extended cluster.

    5. If you are not running dishostseditor on the frontend, transfer the saved files dishosts.conf and cluster.conf to the directory /etc/dis on the frontend.

  4. Restart the network manager on the frontend. If you run sciadmin, the new nodes should show up as red icons. All other nodes should continue to stay green.

  5. Cable the new nodes:

    1. First create the cable connections between the new nodes.

    2. Then connect the new nodes to the cluster. Proceed cable-by-cable, which means you disconnect a cable at an "old" node and immediately connect it to a new node (without disconnecting another cable first). This will ensure continue operation of all "old" nodes.

    3. When you are done, all LEDs on all adapters should light green, and all node icons in sciadmin should also light green.

  6. Perform the cable test from within sciadmin to ensure that the cabling is correct (see Chapter 4, Initial Installation, Section 3.7.4, “Cabling Correctness Test”).

    Warning

    Running the cable test will stop other traffic on the interconnect for the time the test is running, which can be up to a minute. If this is not an option, please use scidiag from the command line to verify the functionality of the interconnect (see Chapter 7, Interconnect Maintenance, Section 1.1.3, “Static Interconnect Test”).

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