IBM z13s, Техническое руководство

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Chapter 2. Central processor complex hardware components
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򐂰 Host Channel Adapter (HCA3-O LR (1xIFB)): This optical long reach fanout provides
1x InfiniBand coupling link connectivity up to a 10 km (6.2 miles) unrepeated, or 100 km
(62 miles) when extended by using z Systems qualified DWDM equipment) distance to
z13s, z13, zEC12, zBC12, z196, and z114 servers.
When you are configuring for availability, balance the channels, coupling links, and OSAs
across drawers. In a system that is configured for maximum availability, alternative paths
maintain access to critical I/O devices, such as disks and networks.
򐂰 Preferred plugging for PCIe Generation 3 fanouts will always be in CPC Drawer 1 (bottom
drawer) alternating between the two nodes. Previous systems EC12 and z114 were
plugged across two drawers. This configuration is for performance reasons and to
maintain RAS characteristics.
򐂰 If the configuration contains two CPC drawers, two PCIe I/O drawers, and PCIe ICA
Coupling adapters. All PCIe Generation 3 fanouts are plugged in CPC Drawer 1, and all
PCIe ICA coupling adapters are plugged in CPC Drawer 0 (top), alternating between the
internal node affinity.
A fanout can be repaired concurrently with the use of redundant I/O interconnect.
2.6.1 Redundant I/O interconnect
Redundancy is provided for both InfiniBand I/O and for PCIe I/O interconnects.
InfiniBand I/O connection
Redundant I/O interconnect is accomplished by the facilities of the InfiniBand I/O connections
to the InfiniBand Multiplexer (IFB-MP) card. Each IFB-MP card is connected to a jack in the
InfiniBand fanout of a CPC drawer. IFB-MP cards are half-high cards and are interconnected
through the I/O drawer backplane. This configuration allows redundant I/O interconnect if the
connection coming from a CPC drawer ceases to function. This situation can happen when,
for example, a CPC drawer connection to the I/O Drawer is broken for maintenance.
Note: Fanout plugging rules for z13s servers are different than previous EC12 and z114
servers.