User`s guide

2.4.2 Rack Precautions

 Ensure that the leveling jacks on the bottom of the rack are fully extended to the

floor with the full weight of the rack resting on them.

 In single rack installation, stabilizers should be attached to the rack. In multiple rack

installations, the racks should be coupled together.

 Always make sure the rack is stable before extending a component from the rack.

 You should extend only one component at a time - extending two or more

simultaneously may cause the rack to become unstable.

2.4.3 Server Precautions

 Review the electrical and general safety precautions in Chapter 4.

 Determine the placement of each component in the rack before you install the rails.

 Install the heaviest server components on the bottom of the rack first, and then work

up.

 Use a regulating uninterruptible power supply (UPS) to protect the server from power

surges, voltage spikes and to keep your system operating in case of a power failure.

 Allow any hot plug drives and power supply modules to cool before touching them.

 Always keep the rack's front door and all panels and components on the servers closed

when not servicing to maintain proper cooling.

2.4.4 Rack Mounting Considerations

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 ambient temperature of the room. Therefore,

consideration should be given to installing the equipment in an environment compatible

with the manufacturer’s maximum rated ambient temperature (Tmra).

Reduced Airflow

Equipment should be mounted into a rack so that the amount of airflow required for safe

operation is not compromised.

Mechanical Loading

Equipment should be mounted into a rack so that a hazardous condition does not arise due

to uneven mechanical loading.

Circuit Overloading

Consideration should be given to the connection of the equipment to the power supply

circuitry and the effect that any possible overloading of circuits might have on overcurrent

protection and power supply wiring. Appropriate consideration of equipment nameplate

ratings should be used when addressing this concern.

bullx R423-E3 - Installation and User's Guide