Building BIOS Architecture

The Building BIOS shall provide redundancy proportional to the building’s scale, complexity, criticality, and required availability.

Redundancy may apply to:

power supply;

BIOS computing units;

persistent storage;

communication paths;

clocks;

network gateways;

configuration replicas;

safety-status reporting;

recovery interfaces.

The architecture shall define:

primary and standby roles;

authority transfer;

failure detection;

failover conditions;

synchronization;

recovery;

reintegration;

Distributed BIOS nodes shall coordinate through explicit ownership of configuration objects and services. Where authority is replicated, the system shall prevent split-brain operation in which multiple nodes issue conflicting authoritative decisions.

During communication partition, local BIOS nodes may continue preauthorized functions within defined limits. They shall not approve configuration changes requiring unavailable building-level authority.

After reconnection, records shall be reconciled without deleting conflicting events. Physical state shall be reverified where digital records cannot establish the actual condition.

Redundancy shall not create common-mode failure through identical unprotected power, network, location, software, or credential dependencies.

Small buildings may use a single active BIOS device if their Engineering Profile provides an appropriate verified backup and replacement strategy. High-criticality buildings may require physically separated redundant BIOS nodes and independent recovery paths.