Migrating from Flex System Manager

If you are planning to manage a chassis with Lenovo XClarity Administrator and that chassis is managed by a Flex System Manager, review these considerations to transition the chassis to XClarity Administrator management successfully.

Depending on your configuration, transitioning from management by Flex System Manager to management by XClarity Administrator might be disruptive to your running workloads. Therefore, consider doing the transition during a maintenance window to minimize downtime with running workloads.

To ensure that XClarity Administrator can manage a chassis that was previously managed by Flex System Manager, complete the following steps:
  1. Optional: Prepare the chassis to be removed from management by Flex System Manager.

    If you are using IBM Fabric Manager (IFM) to virtualize addresses, modify IFM to use push mode to distribute virtual addresses through the CMM. If you are using IFM in pull mode and Flex System Manager is powered off, the virtual addresses will no longer be available after the next restart of the compute node.

    Note: IFM supports the concept of a standby node. In the event of a hardware failure, IFM assigns the virtual address of the failed compute node to the standby node so that it can automatically take over the workload from the failed node. XClarity Administrator does not support the concept of a standby node. Therefore, if you have implemented the standby node, you must devise a different strategy for continuous availability when there is a failed compute node.
    Remember that if virtual addresses are changed, you must adjust infrastructure services as well. For example:
    • If the World Wide Port Name (WWPN) is changed for a compute node, adjust SAN zoning and LUN mapping.
    • If the MAC address for a port is changed, adjust the MAC-to-IP address binding in the DHCP server or clustering software.
    • IFM can configure a virtual boot-target WWN. If you do not migrate correctly, you might lose the ability to start our operating system.
  2. Remove the chassis from management by the Flex System Manager.
  3. Manage the chassis from XClarity Administrator. For information about managing a chassis, see Managing chassis.
  4. Remove any agents that were installed on devices that are managed by the Flex System Manager. The XClarity Administrator implements an agentless management approach. Therefore, you do not need to install agents on managed compute nodes. Although the installed agents have no effect on XClarity Administrator management functions, you can choose to remove those agents and reclaim the space on the compute node.