104 IBM System x3850 X6 and x3950 X6 Planning and Implementation Guide
Fan Zone 3 = fan packs 3 and 4 controlled by the temperature readings near Compute
Book 2, and PCIe slots 7 and 8
Fan Zone 4 = fan packs 5 and 6 controlled by the temperature readings near Compute
Book 3, and PCIe slots 4, 5, and 6
Fan Zone 5 = fan packs 7 and 8 controlled by the temperature readings near Compute
Book 4, and PCI slots 1, 2, and 3
Fan Zone 6 = Power Supply 1-4 fans
Fan speed for all fan zones is controlled by a number of parameters, such as inlet ambient
temperature, CPU temperature, DIMMs, and PCIe card temperatures.
Figure 3-39 shows one of the Compute Book fans and Primary I/O Book fan (for Storage
Book cooling).
Figure 3-39 Compute Book and Primary I/O Book fans
3.24 Upgrading to an 8-socket X6 server
The x3850 X6 server has a flexible modular design that allows you to increase the server’s
compute power and I/O capabilities by adding additional Compute Books and I/O Books. The
modular design also means that if your business needs additional processing or I/O capability
within the same system image, then it is possible to migrate to an eight-socket x3950 X6.
IBM supports upgrading a 4-socket X6 server to an 8-socket X6 server. The two advised
methods are as follows:
Start with a 4-socket x3950 X6 (8U chassis) and add additional processors when needed.
Start with a 4-socket x3850 X6 (4U chassis) and upgrade it when needed using an RPQ
process.
Starting with a 4-socket x3950 X6
With this option, you plan for the need for future 8-socket performance in advance and
purchase an x3950 X6 with only four Compute Books installed. The initial order would contain
these components:
Four Compute Books with E7-8800 v2 series processors
Four Power Supplies (preferably 1400W)
Two Primary IO Book standard
Two Storage Book Standard
Compute Book fan Primary I/O Book fan
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