System information

Chapter 1. Introduction to IBM eServer BladeCenter technology and its advantages 11
The Technical Update can be obtained from the following URLs:
http://www-1.ibm.com/support/docview.wss?uid=psg1MIGR-53353
ftp://ftp.software.ibm.com/pc/pccbbs/pc_servers_pdf/13n0308.pdf
Figure 1-8 MidPlane power connector
1.2.5 BladeCenter blowers
The IBM Eserver BladeCenter ships with both hot-swap blowers which are required to
provide adequate cooling; these blowers provide a total airflow of approximately 325 CFM;
however, each blower will run at approximately 50% under normal conditions. If one blower
fails, the other blower is capable of providing enough cooling for the entire chassis. However,
the failed blower should be replaced within 48 hours. The speed of the blowers is controlled
via the Management Module which receives signals from thermal monitors located in critical
locations. There are two scenarios which will cause both blowers to function at full speed:
򐂰 The management module fails and the redundant module is not present.
򐂰 One of the power supply modules fails.
In Figure 1-9 on page 12, you can see that there are four fins which are currently closed since
the blower is not operational. When operational, the blower draws the air from the front to the
rear. Each blower also has an LED which will light up in the event of an error.