How to Implement the XCAT Service Node Pool

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I am currently working on setting up a hierarchical cluster environment using xCAT and am interested in implementing a service node pool to improve the load balancing and management of our computing resources. Our goal is to ensure that tasks are distributed efficiently among our compute nodes to optimize performance and resource utilization.  In the official document 2.16.5, it was proposed to use a service node pool to achieve load balancing and high availability, but I have not found a specific method or steps to implement a service node pool. I would greatly appreciate it if you could provide guidance on the following aspects: 1.Could you outline the specific steps required to set up a hierarchical cluster service node pool within xCAT? 2.Is there any detailed documentation or tutorials available that cover the setup process from start to finish?