Last Updated on April 16, 2026
This topic describes the process of creating a pool of COS – Service Devices (COS – SDs) within a COS Configuration. The process varies depending on whether the pool of COS – SDs uses the default COS – SD-selection process or a selection process based on load-balancing hardware and software.
The default COS – SD-selection process uses a “round-robin” approach—when multiple COS – SDs are linked to a single COS Configuration, the COS – SDs in the pool are selected for work uniformly. For example, if 5000 testers use a round-robin pool containing 10 COS – SDs, each COS – SD will service approximately 500 testers, regardless of the current workload on the device. This type of pool is not a load-balanced pool.
Alternatively, if you have installed and configured load-balancing hardware and software, you can link COS – SDs to your load-balancing hardware and software to create a load-balanced pool of COS – SDs. COS – SDs in this type of pool are selected for work based on the parameters specified in your load-balancing hardware and software.