Which of the following is not an advantage of BMS over ECS?

The correct answer is C. Quick and elastic adjustment of CPUs and memory . Huawei’s official HUAWEI CLOUD Stack materials describe Bare Metal Server (BMS) as dedicated physical servers that provide excellent or remarkable computing performance and direct access to physical resources. Huawei also explains that Ironic works with Nova and Neutron to manage BMS resources, highlighting the physical-server nature of the service. These characteristics support advantages such as physical isolation , no hypervisor performance overhead , and direct access to specialized hardware .

By contrast, Huawei’s ECS Advantages documentation explicitly says that with ECS, administrators can modify an ECS flavor, including the number of CPUs and memory size . That kind of quick and elastic CPU/memory adjustment is therefore an ECS advantage , not a BMS-over-ECS advantage.

So after correcting the option formatting, A , B , and D are all real BMS strengths, while C belongs more to virtualized ECS elasticity. Therefore, the verified answer is C .

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