Chapter 4. Central processor complex I/O system structure 147
features determines how many PCIe I/O drawers are required. During upgrade to a z13s
server, the correct mix of I/O drawers and PCIe I/O drawers is determined based on the type
and number of I/O features (new and carry-forward) that are required. I/O drawers cannot be
ordered.
The PCIe I/O drawers support the following PCIe features:
FICON Express16S
FICON Express8S
OSA-Express5S
OSA-Express4S
10GbE RoCE Express
Crypto Express5S
Flash Express
zEDC Express
A maximum of one I/O drawer can be carried forward only for FICON Express8 cards (also
carry-forward). As such, a maximum of 8 FICON Express8 cards (a total of 32 FICON
Express8 ports) can be carried forward.
4.6 Fanouts
The z13s server uses fanout cards to connect the I/O subsystem to the CPC drawer. The
fanout cards also provide the ICA SR and InfiniBand coupling links for Parallel Sysplex. All
fanout cards support concurrent add, replace, and move.
The internal z13s I/O infrastructure consists of PCIe fanout cards and InfiniBand fanout cards:
The PCIe Generation3 fanout card is a one port card and connects to a PCIe I/O drawer
supporting an eight-slot I/O domain. This card is always installed in pairs to support I/O
domain redundant connectivity.
The InfiniBand HCA2-C fanout card is available for carry-forward of FICON Express8
features that are installed in I/O drawers.
The PCIe and InfiniBand fanouts are installed in the front of each CPC drawer. A two node
CPC drawer has eight PCIe Gen3 fanout slots and four InfiniBand fanout slots. The PCIe
fanout slots are named LG02 - LG06 and LG11 - LG15, left to right. The InfiniBand fanout
slots are in the middle of the CPC drawer and are named LG07 - LG10, left to right. Slots
LG01 and LG16 are not used for I/O infrastructure. Different numbers of fanouts slots are
supported according to models of z13s servers:
N10, maximum of four PCIe fanouts and two IFB fanouts supported
N20 single CPC drawer, maximum of eight PCIe fanouts and four IFB fanouts supported
N20 with two CPC drawers, maximum of 16 PCIe fanouts and eight IFB fanouts supported
Consideration: On a new build z13s server, only PCIe I/O drawers are supported. A
mixture of I/O drawers, and PCIe I/O drawers are available only on upgrades to a z13s
server.
Consideration: FICON Express8 cards are supported as carry-forward only for z13s
servers. They are installed in an I/O drawer. The installation of an I/O drawer limits the
LPAR storage size to 1 TB (independent from the IOCP definition). Moreover,
each I/O
drawer affects the total fanout slots for PSIFB.
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