Fan Modules - Lenovo 8721 Product Manual

Fan modules

The Enterprise Chassis supports up to a total of ten hot-swap fan modules: two 40 mm (1.57 in) fan
modules and eight 80 mm (3.14 in) fan modules.
The two 40 mm fan modules distribute airflow to the I/O modules and chassis management modules. Both
of these fan modules ship with the chassis. The 80 mm fan modules distribute airflow to the compute
nodes through the chassis from front to rear. Each 80 mm fan module actually contains two 80 mm fan
modules, back to back at each end of the module, which are counter-rotating. The following figure shows
the 80 mm fan module.
Figure 11. 80 mm fan module
Four 80 mm fan modules are installed standard in chassis model 8721-A1x and CTO orders. The
maximum number of 80 mm fan modules that can be installed is eight. Ordering information is shown in
the following table. When the modules are ordered as a part number, they are supplied as a pair. The
feature codes is comprised of one fan.
Table 10. Fan module ordering information
Description
Flex System Enterprise Chassis 80mm Fan Module
The 80 mm fan modules are populated, depending on the nodes installed. To support the base
configuration and up to four nodes, chassis model 8721-A1x ships with four 80 mm fan modules and two
40 mm fan modules preinstalled. There are two cooling zones for the nodes: a left zone and a right zone.
Fan modules must be installed in pairs as shown in the following figure. If there are insufficient fan
modules for the number of nodes installed, the compute nodes might be throttled to balance heat
generation and cooling capacity.
Flex System Enterprise Chassis
Part number Feature code
43W9078 A0UA
(2 fan modules) (1 fan module)
19