System information

Chapter 1. Introduction to IBM eServer BladeCenter technology and its advantages 15
Figure 1-12 BladeCenter 2-Port Fibre Channel Switch Module
The storage options for the IBM Eserver BladeCenter are covered in Chapter 3, “Storage
options for the BladeCenter” of the Redpaper The Cutting Edge: IBM Eserver BladeCenter,
REDP3581.
1.2.9 BladeCenter Acoustic Attenuation Module
In environments where it is important to minimize sound emissions, there is a noise reduction
option available that can be installed on the rear of the IBM Eserver BladeCenter. This
option is called the BladeCenter Acoustic Attenuation Module (acoustic module or muffler).
The acoustical noise emissions for a single BladeCenter unit configured with 14
IBM Eserver BladeCenter HS20 servers are:
򐂰 7.4 bels (operating)
򐂰 7.4 bels (idling)
The acoustical noise emissions for a single BladeCenter unit with a BladeCenter Acoustic
Attenuation Module option installed and configured with 14 IBM Eserver BladeCenter HS20
servers are:
򐂰 6.9 bels (operating)
򐂰 6.9 bels (idling)
For visibility purposes, the system LEDs on the rear of the BladeCenter unit have been
replicated on the acoustic module, as these are covered when this option is fitted. The
acoustic module also fully covers the blower modules and partly covers the other modules
installed.
Note: The BladeCenter Acoustic Attenuation Module requires approximately eight inches
between the rear of the IBM Eserver BladeCenter and the rack door. For this reason, the
NetBay 42 Enterprise Rack Cabinet should be used when installing the IBM Eserver
BladeCenter with this option.