CRUs：
CRUs are components that customers can replace at the deployment site by referring to the operation guides of CRUs.
Customers are allowed to replace CRUs, but are prohibited from replacing other components, due to the risk of personal injury and device damage.
FRUs：
FRUs are components that engineers can replace at the deployment site by referring to the operation guides of FRUs.
Operators: Huawei technical support engineers and maintenance engineers as well as technical support engineers and maintenance engineers certified by Huawei
Replaceable modules: controllers, interface modules, system subracks, management modules, cables, fan modules, assistant cooling modules, and quorum servers
To effectively check software and hardware status and ensure the successful replacement of an FRU, use the FRU replacement tool of OceanStor SmartKit to guide you through the replacement.
