58 IBM System x3850 X6 and x3950 X6 Planning and Implementation Guide
The rear of the x3850 X6 has up to three I/O Books:
One primary I/O Book with 3 PCIe 3.0 slots, one ML2-slot for Ethernet adapters, two
hot-swappable fans, one IMM2 Ethernet port, 4 USB 2.0 ports, video port, and serial port.
Two additional I/O Books, each with 3 PCIe 3.0 ports, which can be used for half-length or
full-length PCIe cards.
We describe the I/O Books in 3.11, “I/O subsystem” on page 84.
At the bottom of the server at the rear are bays for up to four power supply modules. We
describe them in detail in 3.22, “Power subsystem” on page 101.
Figure 3-5 shows the rear of the x3950 X6.
Figure 3-5 Rear view of the x3950 X6
3.5 Ports and controls
The x3850 X6 and x3950 X6 servers have a broad set of I/O ports and controls including an
LCD system information display panel located on the front operator panel. In this section, we
give a detailed description of ports, controls, and LEDs located on the X6 server.
3.5.1 The front operator panel
The front operator panel is a panel located on the front side of the Storage Book, which
contains controls and LEDs that provide information about the status of the server.
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