Silicon Graphics Altix XE340, Руководство пользователя, Страница: 15 / 70

1U Twin: System Notes
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activity and system overheat conditions. Each control panel also includes a main power button and
a system reset button.
Rear I/O Panel
The system is a 1U rackmount chassis. Its I/O panel provides slots for two low-profile PCI-E x16
expansion cards, two COM ports, four USB ports, two VGA ports and four Gb Ethernet ports.
Two optional InfiniBand ports are available (one per serverboard).
Cooling System
The server chassis has an innovative cooling design that features an air shroud and three sets of
4-cm counter-rotating fans per node (configured as six fans placed back-to-back in pairs). A fan
speed control setting in BIOS allows fan speed to be determined by system temperature.
1U Twin: System Notes
As a 1U Twin configuration, the Altix XE340 is different from a traditional single-motherboard
server system. With two nodes incorporated into a single chassis, there are several functional
points you should keep in mind as listed in the following subsections.
System Power
A single power supply is used to provide the power for both serverboards. Each serverboard
however, can be shut down independently of the other with the power button on its own control
panel.
Although they share a common power supply, the I2C signals used for power supply monitoring
are received by the primary serverboard only. (When viewed from the front of the chassis, the
serverboard on the right is referred to as the primary board and the serverboard on the left as the
secondary.) See Figure 1-3 on page 8 for a top-down view of the power supply and other major
components.