Power Supply Redundancy; Fan Redundancy; Environmental Monitoring - Sun Microsystems Netra T2000 Installation Manual

Power Supply Redundancy

The server features two redundant hot-swappable power supplies, enabling the
server to continue operating should one of the power supplies fail or if one power
source fails.

Fan Redundancy

The server has two drive specific fans that work in conjunction with the two power
supply fans to provide cooling for the internal disk drives. Additionally, there are
three fans to cool the motherboard components.

Environmental Monitoring

The server features an environmental monitoring subsystem protects the server and
its components against:
Extreme temperatures
■
Lack of adequate airflow through the server
■
Power supply failures
■
Hardware faults
■
Temperature sensors are located throughout the server to monitor the ambient
temperature of the server and internal components. The software and hardware
ensure that the temperatures within the enclosure do not exceed predetermined safe
operating levels. 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
panel. If the temperature condition persists and reaches a critical threshold, the
server initiates a graceful system shutdown. If the ALOM fails, backup sensors
protect the server from serious damage, by initiating a forced hardware shutdown.
All error and warning messages are sent to the system console and logged in the
ALOM console log file. Service Required LEDs remain lit after an automatic system
shutdown to aid in problem diagnosis.
The monitoring subsystem is also designed to detect fan failures. The system
features integral power supply fans, as well as one PCI fan and three blowers. If the
PCI fan or blower fails, the monitoring subsystem detects the failure and generates
an error message to the system console, logs the message in the
/var/adm/messages file, and lights the Service Required LEDs.
Chapter 1 Netra T2000 Overview 9