IBM 88861TU, Planning Manual

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Noise considerations
Each BladeCenter S chassis has four fan modules for cooling and each fan module
has 2 fans. The fan modules generate measurable noise.
The sound levels for the BladeCenter S chassis range from 6.3 bels to 6.8 bels
depending on the number and type of blade servers that are installed.
The actual sound-pressure levels in your installation depend on a variety of
factors, including the number of servers in the installation, the size, materials, and
configuration of the room where the servers are installed, the noise levels from
other equipment, the room ambient temperature, and employees' location in
relation to the equipment.
Your server installation may be subject to government regulations, such as those
prescribed by OSHA or European Community Directives, that cover noise-level
exposure in the workplace. Consult a qualified person, such as an industrial
hygienist, to determine the sound-pressure levels to which your employees are
exposed.
Power considerations
When planning for power, you need to determine how many power modules you
intend to install (either 2 or 4) and whether they are going to be connected to 110
V ac or 220 V ac power sources. In addition, you need to determine the type of
power management policy that you intend to implement.
The power modules for the BladeCenter S system can accept either low voltage
range (110 V ac nominal) or high voltage range (220 V ac nominal) line input from
your power utility distribution network.
At a minimum, you need to install two power modules, and they must be installed
in power module bays 1 and 2. These power modules will provide power to the
following components:
v
Blade server bays 1 through 6
v
I/O module bays 1 through 4
v
Advanced management module module bay
v
Serial Pass-Thru Module module bay
v
Storage module bay 1
v
Fan module bays 1 through 4
If you are going to install a storage module in bay 2, you will also need to install
two additional power modules in power module bays 3 and 4. In addition, the
configuration of the blade servers that you have installed might require that you
installed additional power modules.
In addition to this information, you can use the IBM System x and BladeCenter
Power Configurator at http://www.ibm.com/systems/bladecenter/powerconfig/
to assist in planning for power.
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BladeCenter S Type 7779/8886: Planning Guide