The IBM Power E1050 server has a 10-NVMe backplane that is always present in the server. It offers up to 10 NVMe bays with all four processor sockets populated and six NVMe bays if only two or three processor sockets are populated. It connects to the system board through three Molex Impact connectors and a power connector. There is no cable between the NVMe backplane and the system board.
The wiring strategy and backplane materials are chosen to ensure Gen4 signaling to all NVMe drives. All NVMe connectors are PCIe Gen4 connectors. For more information about the internal connection of the NVMe bays to the processor chips, see Figure 2-13 on page 66.
Each NVMe interface is a Gen4 x4 PCIe bus. The NVMe drives can be in an OS-controlled RAID array. A hardware RAID is not supported on the NVMe drives. The NVMe thermal design supports 18 W for 15-mm NVMe drives and 12 W for 7-mm NVMe drives.
For more information about the available NVMe drives and how to plug the drives for best availability, see 3.5, “Internal storage” on page 92.
2.3.4 Attachment of I/O-drawers
The Power E1050 server can expand the number of its I/O slots by using I/O Expansion Drawers (#EMX0). The number of I/O drawers that can be attached to an Power E1050 server depends on the number of populated processor slots, which changes the number of available internal PCIe slots of the server. Only some slots can be used to attach an I/O Expansion Drawer by using the #EJ2A CXP Converter adapter, also referred to as a cable card.
Feature Code #EJ2A is an IBM designed PCIe Gen4 x16 cable card. It is the only supported cable card to attach fanout modules of an I/O Expansion Drawer in the Power E1050 server. Previous cards from a Power E950 server cannot be used. Feature Code #EJ2A supports copper and optical cables for the attachment of a fanout module.
Note: The IBM e-config configurator adds 3-meter copper cables (Feature Code #ECCS) to the configuration if no cables are manually specified. If you want to have optical cables make sure to configure them.
Table 2-11 lists the PCIe slot order for the attachment of an I/O Expansion Drawer, the maximum number of I/O Expansion Drawers and Fanout modules, and the maximum number of available slots (dependent on the populated processor sockets).
Table 2-11 I/O Expansion Drawer capabilities depend on the number of populated processor slots
For more information about the #EMX0 I/O Expansion Drawer, see 3.9.1, “PCIe Gen3 I/O expansion drawer” on page 99.
2.3.5 System ports
The Power E1050 server has two 1-Gbit Ethernet ports and two USB 2.0 ports to connect to the eBMC service processor. The two eBMC Ethernet ports are used to connect one or two HMCs. There are no other HMC ports, as in servers that have a Flexible Service Processor (FSP). The eBMC USB ports can be used for a firmware update from a USB stick.
The two eBMC Ethernet ports are connected by using four PCIe lanes each, although the eBMC Ethernet controllers need only one lane. The connection is provided by the DCM0, one from each Power10 chip. For more information, see Figure 2-13 on page 66.
The eBMC module with its two eBMC USB ports also is connected to the DCM0 at chip 0 by using a x4 PHB, although the eBMC module uses only one lane.
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For more information about attaching an Power E1050 server to an HMC, see Accessing the eBMC so that you can manage the system.
For more information about how to do a firmware update by using the eBMC USB ports, see Installing the server firmware on the service processor or eBMC through a USB port.