Replacing a power supply unit | 5 |
You can use external labels as a guide. The power supplies and fan assemblies are labeled with an airflow symbol on the faceplate to indicate whether the assembly takes in or exhausts air. The symbol also appears on the top of the FRU. All FRUs in a chassis must have the same label affixed so that airflow direction is consistent. Figure 18 illustrates examples of the airflow labels.
E
AIRFLOW AIRFLOW
FIGURE 18 Examples of airflow symbols
The green E symbol indicates an exhaust FRU. This unit pulls air in from the front of the switch and exhausts it out the rear side. This is called front-to-back airflow or forward airflow.
The orange I symbol indicates an intake FRU. This unit pulls air in from the rear side of the switch and exhausts it out the front side. This is called back-to-front airflow or reverse airflow.
The show chas command displays a device’s airflow direction: Front-to-Back or Back-to-Front.
Replacing a power supply unit
CAUTION
Remove the power cord from a power supply before you install it in or remove it from the device. Otherwise, the power supply or the device could be damaged as a result. (The device can be running while a power supply is being installed or removed, but the power supply itself should not be connected to a power source.)
CAUTION
For the Brocade ICX 6650 devices, be sure that the airflow direction of the power supply unit matches that of the installed fan tray. The power supplies and fan trays are clearly labeled with either a green arrow with an “E”, or an orange arrow with an “I.”
ATTENTION
Maintain all power supply and fan assemblies in operational condition to provide redundancy.
CAUTION
Because the cooling system relies on pressurized air, do not leave any of the power supply and fan assembly slots empty longer than two minutes while the switch is operating. If a power supply or fan assembly fails, leave it in the switch until it can be replaced.
Brocade ICX 6650 Hardware Installation Guide | 41 |
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