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Hot-Pluggable and Hot-Swappable Components
SPARC Enterprise T5440 server hardware is designed to support hot-plugging of the chassis-
mounted hard drives, and hot-swapping of fan units power supplies. By using the proper
software commands, you can install or remove these components while the system is
running. Hot-swap and hot-plug technology significantly increases the system’s serviceability
and availability by providing the ability to replace hard drives, fan units, and power supplies
without service disruption.
Power Supply Redundancy
The SPARC Enterprise T5440 server provides four hot-swappable power supplies, enabling
the system to continue operating should one of the power supplies fail or if a power source
fails.
Environmental Monitoring
The SPARC Enterprise T5440 server features an environmental monitoring subsystem that
protects the server and its components against:
Extreme temperatures
Lack of adequate airflow through the system
Power supply failures
Hardware faults
Temperature sensors are located throughout the system to monitor the ambient temperature of
the system and internal components. The software and hardware ensure that the temperatures
within the enclosure do not exceed predetermined safe operating ranges. If the temperature
observed by a sensor falls below a low-temperature threshold or rises above a high-
temperature threshold, the monitoring subsystem software lights the amber Service Required
LEDs on the front and rear panels. If the temperature condition persists and reaches a critical
threshold, the system initiates a graceful system shutdown. In the event of a failure of the
system controller, backup sensors protect the system from serious damage, by initiating a
forced hardware shutdown. Service Required LEDs remain lit after an automatic system
shutdown to aid in problem diagnosis.
The power subsystem is monitored in a similar fashion by monitoring power supplies and
reporting any fault in the front and rear panel LEDs.