Adding a control enclosure to an existing system (customer task)

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To add a control enclosure to an existing system, the IBM SSR must first install the new control enclosure in the rack. The SSR then cables the system to a Fibre Channel switch, to a 25 Gbps Ethernet switch, or between Fibre Channel adapters.

When SAN is being used, connect the new control enclosure to the system through a zone that you configure in the SAN. When you are using RDMA over Ethernet, you must assign IP addresses. When you are connecting the Fibre Channel adapters directly, you can bypass network setup.

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To add a control enclosure to an existing system, complete the following steps.

  1. The SSR installs the control enclosure and completes cabling.
  2. The SSR connects the canisters directly, connects them to the storage area network, or connects them to a 25 Gbps or faster Ethernet network.
    1. To directly connect the new control enclosure to a control enclosure with an existing system, see Connecting two control enclosures directly with Fibre Channel cables.
    2. To connect the new control enclosure that uses the SAN, see Connecting Fibre Channel cables to the control enclosure.
    3. To connect the new control enclosure by using RDMA, see Configuration details for using RDMA-capable Ethernet ports for node-to-node communications.
  3. For SAN connections, complete all SAN configuration before installation and you must update the network planning sheets.

    The correct zoning provides a way for the Fibre Channel ports to connect to each other.

  4. For RDMA connections, ensure that the new control enclosure is connected to the same Ethernet subnet as the existing system.

    For the new node canisters to use RDMA over Ethernet, use the service assistant tool or the satask chnodeip command to set the node IP of each new node in the system.

  5. In the management GUI, select Monitoring > System. On the System -- Overview page, select Add Enclosure. When a new enclosure is cabled correctly to the system, the Add Enclosure action automatically displays on the System -- Overview page. If this action does not appear, review the installation instructions to ensure that the new enclosure is cabled correctly. You can also add an enclosure by selecting Add Enclosure from the System Actions menu.
  6. Complete the instructions in the Add Enclosures wizard until the control enclosure is added to the system.
  7. If exactly two control enclosures are in the system, you must set up a quorum disk or application outside of the system. If the two control enclosures lose communication with each other, the quorum disk prevents both I/O groups from going offline. For more information, see Configuring quorum.