FUJITSU SPARC ENTERPRISE T5220 - Manual (Page 27)

Server Features 11
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 T5120 and T5220 servers provide two 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 T5120 and T5220 servers feature 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
operation 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 back
panel. 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. 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.
Support for RAID Storage Configurations
You can set up hardware RAID 1 (mirroring) and hardware RAID 0 (striping)
configurations for any pair of internal hard drives, providing a high-performance
solution for hard drive mirroring.