Jan 13, 2022
Power supply features – Introduction to Power E1080
1.5.7 Power supply features
Each Power E1080 server node has four 1950 W bulk power supply units that are operating at 240 V. These power supply unit features are a default configuration on every Power E1080 system node. The four units per system node do not have an associated feature code and are always auto-selected by the IBM configurator when a new configuration task is started.
Four power cords from the power distribution units (PDU) drive these power supplies, which connect to four C13/C14 type receptacles on the linecord conduit in the rear of the system. The power linecord conduit source power from the rear and connects to the power supply units in the front of the system.
The system design provides N+2 redundancy for system bulk power, which allows the system to continue operation with any two of the power supply units functioning. The failed units must remain in the system until new power supply units are available for replacement.
The power supply units are hot-swappable, which allows replacement of a failed unit without system interruption. The power supply units are placed in front of the system, which makes any necessary service that much easier.
Figure 1-7 shows the power supply units and their physical locations marked as E1, E2, E3, and E4 in the system.
Figure 1-7 Power supply units
24 IBM Power E1080: Technical Overview and Introduction
1.5.8 System node PCIe interconnect features
Each system node provides 8 PCIe Gen5 hot-plug enabled slots; therefore, a 2-node system provides 16 slots, a 3-node system provides 24 slots, and a 4-node system provides 32 slots.
Up to four I/O expansion drawer features #EMX0 can be connected per node to achieve the slot capacity that is listed in Table 1-14.
Table 1-14 PCIe slots availability for different system nodes configurations
Each I/O expansion drawer consists of two Fanout Module feature #EMXH, each providing six PCIe slots. Each Fanout Module connects to the system by using a pair of CXP cable features. The CXP cable features are listed in Table 1-16 on page 27.
Table 1-15 Optical CXP cable feature
The RPO-only cables in this list are not available for ordering new or MES upgrade, but for migrating from a source system. Select a longer length feature code for inter-rack connection between the system node and the expansion drawer.
The one pair of CXP optical cable connects to system node by using one 2-ports PCIe optical cable adapter feature EJ24, which is placed in the CEC.
Both CXP optical cable pair and the optical cable adapter features are concurrently maintainable. Therefore, careful balancing of I/O, assigning adapters through redundant EMX0 expansion drawers, and different system nodes can ensure high-availability for I/O resources that are assigned to partitions.
For more information abut internal buses and the architecture of internal and external I/O subsystems, see 2.5, “Internal I/O subsystem” on page 83.
Chapter 1. Introduction to Power E1080 25