Sun Microsystems Fire 880, Руководство пользователя

Страница: 94 / 236

76 Sun Fire 880 Server Owner’s Guide • August 2001
In systems configured with the redundant cooling option, only the primary fan trays
are running during normal system operation. If a primary fan tray fails, the
environmental monitoring subsystem detects the failure and automatically activates
the secondary fan tray.
All fan trays feature a hot-swap capability. You can remove and replace a faulty fan
tray without shutting down the operating system or turning off the system power.
For additional details, see “About Hot-Pluggable and Hot-Swappable Components”
on page 144.
For each fan in the system, the environmental monitoring subsystem monitors or
controls the following:
■
Fan present (monitored)
■
Fan speed in revolutions per minute (RPM) (monitored) – Used to detect early fan
degradation
■
Fan power input (controlled) – Used to increase or decrease the airflow and
cooling capacity
■
Fan fault LEDs (controlled)
Only the primary CPU fans have variable speed control. The secondary CPU fans,
the primary and secondary motherboard fans, and the primary and secondary I/O
fans can only be turned fully on or fully off. Fan speed is controlled by the
environmental monitoring subsystem in response to temperature conditions inside
the system. For additional details, see “Environmental Monitoring and Control” on
page 16.
Status indicator LEDs provide power, fault, and hot-plug indications for each fan
tray. For information about the status indicator LEDs, see “About Fan Tray LEDs” on
page 164.
Note – All internal options (except disk drives and power supplies) must be
installed only by qualified service personnel. For information about installing or
removing fan tray assemblies, see the
Sun Fire 880 Server Service Manual , which is
included on the Sun Fire 880 Documentation CD .
Configuration Rules
■
The minimum system configuration requires a complete set of three working fan
trays — an I/O fan tray, a CPU fan tray, and a motherboard fan tray.
■
If the system does not include a secondary CPU fan tray, a CPU fan tray filler
panel must be installed in its place.