Chapter 4. Central processor complex I/O system structure 179
Up to eight PCIe and four IFB fanout cards can be installed in each CPC drawer, as shown in
Figure 4-9.
Figure 4-9 CPC drawer front view: Coupling links
Previous generation z Systems machines, the z114 and zBC12, use a different design of
CPC drawer that provides connectivity for up to four InfiniBand fanouts per drawer.
As an example of a possible migration case, assume a one-drawer zBC12 used as
stand-alone coupling facility with all four fanouts that are used for IFB connectivity. In a 1:1
link migration scenario, this server cannot be migrated to a z13s-N10 because the z13s-N10
cannot accommodate more than two InfiniBand fanouts. Furthermore, if FICON Express8
features are carried forward, the total number of InfiniBand fanout are reduced by two. For
more information, see 4.6.6, “Fanout considerations” on page 152.
HCA2 and 3 Fanouts
PCIe Gen3 Fanouts
PCIe Gen3 Fanouts
PCIe-O SR Link
(Integrated Coupling Adapter)
HCA2-C (I/O Drawer)
or
HCA3-O (1X or 12X PSIFB Links)
ICA
PCIe-O SR Link
(Integrated Coupling Adapter)
ICA
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