Fan Modules - Cisco MDS9120 - MDS 9120 Multilayer Fabric Switch Installation Manual

Fan Modules

S e n d d o c u m e n t a t i o n c o m m e n t s t o m d s f e e d b a c k - d o c @ c i s c o . c o m
Caution Power supplies for the Cisco 9100 Series look similar but they differ slightly. Be sure to use the correct
power supply designated for your Cisco 9100 Series switch. Using an incorrect power supply will not
provide redundant power in the case of a power supply failure.
The power supply has two LEDs, AC ok and DC ok. Power supply status is also indicated on a front
panel LED.
Procedures for replacing and installing the power supplies are available in the
Components" section on page
The Cisco MDS 9124 Switch includes a front panel reset button that resets the switch without cycling
the power.
If the Cisco MDS 9124 switch has only one power supply and supports SAN-OS Release 3.3(x), the
Note
normal FAN LED indication is Amber light.
If the Cisco MDS 9124 switch has only one power supply and supports NX-OS Release 4.1(x) or later,
the normal FAN LED indication is Green light.
The Cisco MDS 9134 Switch includes a reset button on the left side of the switch as shown in
Figure 1-6
Reset button
Fan Modules
The Cisco MDS 9148 Switch, Cisco MDS 9140 Switch, the Cisco MDS 9134 Switch, and the
Cisco MDS 9120 Switch support two hot-swappable fan modules that allow the switches to continue to
run if a fan module fails, or is removed or both. The switches would continue to run provided the preset
temperature thresholds have not been exceeded. You can swap out a fan module without having to bring
the system down. Each fan module on the Cisco MDS 9134 Switch and Cisco MDS 9148 Switch has two
fans. The Cisco MDS 9124 Switch includes three fixed fans and an additional fan in each removable
power supply. For normal operation, the Cisco MDS 9124 Switch requires four fans.
Caution The Cisco MDS 9000 Family has internal temperature sensors that are capable of shutting down the
system if the temperature at different points within the chassis exceed certain safety thresholds. To be
effective, the temperature sensors require the presence of airflow; therefore, in the event a fan module is
removed from the chassis, the Cisco MDS 9140 Switch and the Cisco 9120 Switch will shut down after
five minutes to prevent potentially undetectable overheating. However, the switches will shut down
Cisco MDS 9100 Series Hardware Installation Guide
1-8
2-25.
Reset Button on the Side of the Cisco MDS 9134 Switch
Chapter 1 Product Overview
"Removing and Installing
Figure 1-6.
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