Cisco MDS 9700 Series User Manual

If a fan module fails, it does not affect the thermal performance of the system. The redundant fan controllers
and other internal mechanisms ensure that the switch, and fan modules are operational.
If a single fan module fails, the system continues to operate under all conditions. Two fan failures might cause
alarms from ASIC when the temperature exceeds the threshold. At 86°F (30°C) or less, a single fan module
can be removed and the system can continue to operate up to 72 hours to allow for replacement of a failed
fan module. When the temperature exceeds the threshold, the device automatically shuts down in 3 minutes.
Cisco MDS 9718 Director Fan Modules
The Cisco MDS 9718 Director has three fan modules, each with six fans, that are installed vertically at the
back of the chassis. Each fan module can be removed while the other two fan modules continue to move air
through the chassis.
The fan modules cover the crossbar fabric switching modules in the back of the chassis. Fan module 1 must
be removed to access the crossbar fabric switching modules 1 and 2, fan module 2 must be removed to access
the crossbar fabric switching modules 3 and 4, and the fan module 3 must be removed to access the crossbar
fabric switching modules 5 and 6.
Cisco MDS 9700 Series Switches Hardware Installation Guide
53
Product Overview
Cisco MDS 9718 Director Fan Modules

Cisco MDS 9700 Series Specifications

General

Brand	Cisco
Model	MDS 9700 Series
Category	Switch
Language	English