Specifications
5102ch02.fm Draft Document for Review May 12, 2014 12:46 pm
40 IBM Power System S822 Technical Overview and Introduction
Table 2-6 I/O bandwidth
PCIe Interconnect: Each POWER8 processor has 48 PCIe lanes running at 8 Gbps
full-duplex. The bandwidth formulas is calculates as follows:
48 lanes * 2 processors * 8 Gbps * 2 = 192 GBps
2.4 Internal I/O subsystem
The internal I/O subsystem resides on the system planar, which supports PCIe slots. PCIe
adapters on the Power S822 are hot pluggable.
All PCIe slots support Enhanced Error Handling (EEH). PCI EEH-enabled adapters respond
to a special data packet generated from the affected PCIe slot hardware by calling system
firmware, which will examine the affected bus, allow the device driver to reset it, and continue
without a system reboot. For Linux, EEH support extends to the majority of frequently used
devices, although certain third-party PCI devices might not provide native EEH support.
2.4.1 Slot configuration
The amount of PCIe slots available on the Power S822 depends on the storage backplane
used (#EJ0T or #EJ0U) and the amount of installed processors. The amount and speed of
the available slots can be seen on the following table:
Table 2-7 PCIe slots versus server configuration
Table 2-8 displays the PCIe Gen3 slot configuration for the server.
Table 2-8 Slot configuration of a Power S822
I/O I/O bandwidth (maximum theoretical)
Total I/O bandwidth Power S822 - one processor:
48 GBps simplex
96 GBps duplex
Power S822 - two processors:
96 GBps simplex
192 GBps duplex
One processor module Two processor modules
Storage backplane
#EJ0T
Qty 2 - x16 Gen3 low profile slots plus
Qty 4 - x8 Gen3 low profile slots
Qty 4- x16 Gen3 low profile slots plus
Qty 5- x8 Gen3 low profile slots
Storage backplane
#EJ0U
Qty 2 - x16 Gen3 low profile slots plus
Qty 3 - x8 Gen3 low profile slots
Qty 4- x16 Gen3 low profile slots plus
Qty 4- x8 Gen3 low profile slots
Slot Description Location code Card size Installed processors
required to enable
Slot 1 PCIe Gen3 x8 P1-C2 Low profile 2
Slot 2 PCIe Gen3 x16 P1-C3 Low profile 2
Slot 3 PCIe Gen3 x16 P1-C5 Low profile 2
Slot 4 PCIe Gen3 x16 P1-C6 Low profile 1