64 Sun Fire V890 Server Owner’s Guide • May 2004
About Fan Trays
The basic system is equipped with three fan trays: a CPU fan tray, an I/O fan tray,
and a motherboard fan tray. The CPU and I/O fan trays contain two fans apiece,
while the motherboard fan tray contains a single fan. All systems are equipped with
this primary set of fan trays and redundant cooling from a secondary set of the same
fan trays.
The motherboard fan tray is also known as the I/O bridge fan tray since its primary
purpose is to cool the I/O bridge chips on the system motherboard.
The following table describes the system’s fan trays.
Fan(s) Bay Description
Primary CPU fan tray 1 One fan tray with two 6-inch fans
Secondary CPU fan tray 2 One fan tray with two 6-inch fans
Primary I/O fan tray 3 One fan tray with two 4-inch fans
Secondary I/O fan tray 4 One fan tray with two 4-inch fans
Primary motherboard fan tray 5 One 3-inch fan
Secondary motherboard fan tray 6 One 3-inch fan
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