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Rear view

The rear of the server provides access to several connectors and components.

Rear view with four 2.5-inch rear drive bays and six PCIe slots


Rear view with four rear 2.5-inch drive bays and six PCIe slots

Rear view with eight 2.5-inch rear drive bays and four PCIe slots


Rear view with eight rear 2.5-inch drive bays and four PCIe slots

Rear view with two 3.5-inch rear drive bays and four PCIe slots


Rear view with two rear 3.5-inch drive bays and four PCIe slots

Rear view with four 3.5-inch rear drive bays and two PCIe slots


Rear view of server models with four rear 3.5-inch drive bays and two PCIe slots

Rear view with seven PCIe slots and a DWCM


Rear view with seven PCIe slots and a DWCM

Table 7. Components on the rear of the server
CalloutCallout
1 PCIe slots2 Power supplies
3 NMI button4 USB 3 (5 Gbps) connector
5 Outlet hose6 VGA connector
7 Hose holder8 USB 3 (5 Gbps) connectors
9 Inlet hose10 XCC system management port
11 Ethernet connectors on OCP module (optional) 

Rear view with nine PCIe slots and a DWCM


Rear view with nine PCIe slots and a DWCM

Table 8. Components on the rear of the server
CalloutCallout
1 PCIe slots2 Power supplies
3 NMI button4 USB 3 (5 Gbps) connector
5 Outlet hose6 VGA connector
7 Hose holder8 USB 3 (5 Gbps) connectors
9 Inlet hose10 XCC system management port
11 Ethernet connectors on OCP module (optional) 

Rear view with four 2.5-inch rear drive bays, five PCIe slots, and a DWCM


Rear view with four 2.5-inch rear drive bays, five PCIe slots, and a DWCM

Rear view with eight 2.5-inch rear drive bays, three PCIe slots, and a DWCM


Rear view with eight 2.5-inch rear drive bays, three PCIe slots, and a DWCM

Table 10. Components on the rear of the server
CalloutCallout
1 PCIe slots2 Rear 2.5-inch drive bays (8)
3 Power supplies4 NMI button
5 USB 3 (5 Gbps) connector6 Outlet hose
7 VGA connector8 Hose holder
9 USB 3 (5 Gbps) connectors10 Inlet hose
11 1FH riser cage for DWCM12 XCC system management port
13 Ethernet connectors on OCP module (optional) 

Rear view with two 3.5-inch rear drive bays, three PCIe slots, and a DWCM


Rear view with two 3.5-inch rear drive bays, three PCIe slots, and a DWCM

Table 11. Components on the rear of the server
CalloutCallout
1 PCIe slots2 Rear 3.5-inch drive bays (2)
3 Power supplies4 NMI button
5 USB 3 (5 Gbps) connector6 Outlet hose
7 VGA connector8 Hose holder
9 USB 3 (5 Gbps) connectors10 Inlet hose
11 1FH riser cage for DWCM12 XCC system management port
13 Ethernet connectors on OCP module (optional) 

Rear view with four 3.5-inch rear drive bays, one PCIe slot, and a DWCM


Rear view with four 3.5-inch rear drive bays, one PCIe slot, and a DWCM

Table 12. Components on the rear of the server
CalloutCallout
1 PCIe slots2 Rear 3.5-inch drive bays (4)
3 Power supplies4 NMI button
5 USB 3 (5 Gbps) connector6 Outlet hose
7 VGA connector8 Hose holder
9 USB 3 (5 Gbps) connectors10 Inlet hose
11 1FH riser cage for DWCM12 XCC system management port
13 Ethernet connectors on OCP module (optional) 

Rear components overview

PCIe slots

The PCIe slots are on the rear or front of the server, and your server supports up to 12 PCIe slots. For more information, see PCIe slots and PCIe adapters.

Hot-swap drives and drive bays

The drive bays on the front and rear of your server are designed for hot-swap drives. The number of the installed drives in your server varies by model. When you install drives, follow the order of the drive bay numbers.

The EMI integrity and cooling of the server are protected by having all drive bays occupied. Vacant drive bays must be occupied by drive fillers.

Power supplies

The hot-swap redundant power supply helps you avoid significant interruption to the operation of the system when a power supply fails. You can purchase a power supply option from Lenovo and install the power supply to provide power redundancy without turning off the server.

On each power supply, there are three status LEDs near the power cord connector. For information about the LEDs, see Power supply LEDs.

NMI button

Use this button only when you are directed to do so by Lenovo Support. Press this button to force a nonmaskable interrupt (NMI) to the processor. By this way, you can make the operating system halt (such as Windows Blue Screen of Death) and take a memory dump. You might have to use a pen or the end of a straightened paper clip to press the button.

USB 3 (5 Gbps) connectors

The USB 3.2 Gen 1 (5 Gbps) connectors are direct connect interfaces (DCIs) for debugging, which can be used to attach a USB-compatible device, such as a USB keyboard, USB mouse, or USB storage device.

VGA connector

The VGA connectors on the front and rear of the server can be used to attach a high-performance monitor, a direct-drive monitor, or other devices that use a VGA connector.

XCC system management port

The server has a 1 Gb RJ-45 connector dedicated to Lenovo XClarity Controller (XCC) functions. Through the system management port, you can access the Lenovo XClarity Controller directly by connecting your laptop to the management port using an Ethernet cable. Make sure that you modify the IP settings on the laptop so that it is on the same network as the server default settings. A dedicated management network provides additional security by physically separating the management network traffic from the production network.

Ethernet connectors

Figure 1. OCP module (two connectors)
OCP module (two connectors)

Figure 2. OCP module (four connectors)
OCP module (four connectors)

The OCP module provides two or four extra Ethernet connectors for network connections.

By default, one of the Ethernet connectors on the OCP module can also function as a management connector using the shared management capacity.

Inlet and outlet hoses

The Direct Water Cooling Module (DWCM) spreads two hoses out to connect to the manifolds. The inlet hose conveys warm water from the facility to the cold plates to cool down the processors, and the outlet hose conducts hot water out of the DWCM to realize system cooling.