Cisco UCS C890 M5, Instruction Manual

Page: 35 / 191

Contents Page 36
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Always make sure the rack is stable before extending a server or other
component from the rack.
•
You should extend only one server or component at a time - extending two or
more simultaneously may cause the rack to become unstable.
3.5 Server Precautions
•
Determine the placement of each component in the rack before you install
the rails.
•
Install the heaviest server components at the bottom of the rack first and
then work your way up.
•
Use a regulating uninterruptible power supply (UPS) to protect the server
from power surges and voltage spikes and to keep your system operating in
case of a power failure.
•
Allow any drives and power supply modules to cool before touching them.
•
When not servicing, always keep the front door of the rack and all
covers/panels on the servers closed to maintain proper cooling.
3.6 Rack Mounting Considerations
3.6.1 Ambient Operating Temperature
If installed in a closed or multi-unit rack assembly, the ambient operating
temperature of the rack environment may be greater than the room's ambient
temperature. Therefore, consideration should be given to installing the equipment in
an environment compatible with the ma
nufacturer’s maximum recommended
ambient temperature (TMRA).
3.6.1.1 Airflow
Equipment should be mounted into a rack so that the amount of airflow required for
safe operation is not compromised.
3.6.1.2 Mechanical Loading
Equipment should be mounted into a rack so that a hazardous condition does not
arise due to uneven mechanical loading.