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Chapter 5 on a real Ubuntu 24.04 workstation called mgmt with a real IPMI 2.0 controller carrying a real multi-device FRU tree: walking the tree with fru print and reading each device on its own, extracting a serial the way an RMA form wants it, looping the device ids, the FRU Device Locator records that make discovery work at all, the system GUID and its SMBIOS encoding warning, the entity map that ties a sensor to a part, a sensor presence check, and the two identification commands this controller does not implement, captured as errors and told apart by their completion codes, with the genuine Dell R730 reference beside them.