16 IBM System x3850 X6 and x3950 X6 Planning and Implementation Guide
2.1.2 Storage Book
The Storage Book is accessible from the front of the server. The Storage Book has bays for
1.8-inch (up to 16) or 2.5-inch drives (up to 8), two slots for RAID controllers to connect to
those drive bays, a front operator panel, and USB and video ports. Figure 2-8 shows the
Storage Book.
Figure 2-8 The Storage Book
The x3850 X6 server has one Storage Book; the x3950 X6 has two Storage Books. For more
information about the Storage Book, see 3.10.1, “Storage Book” on page 75.
2.1.3 Primary I/O Book
The Primary I/O Book is the third core module, which provides base I/O connectivity, including
four PCIe slots:
Three standard PCIe 3.0 half-length slots.
A single slot for an ML2 form-factor network adapter
The Primary I/O Book also contains core logic such as the Integrated Management Module II
(IMM2) and UEFI, fan modules, and peripheral ports. The Primary I/O Book installs in the rear
of the server.
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