Chapter 4. Central processor complex I/O system structure 143
The I/O drawer domains and their related I/O slots are shown in Figure 4-2. The IFB-MP
cards are installed at slot 09 at the rear side of the I/O drawer. The I/O features are installed
from the front and rear side of the I/O drawer. Two I/O domains (A and B) are supported. Each
I/O domain has up to four I/O features for FICON Express8 only (carry-forward). The I/O
cards are connected to the IFB-MP card through the backplane board.
Figure 4-2 I/O domains of an I/O drawer
Each I/O domain supports four I/O card slots. Balancing I/O cards across both I/O domains is
automatically done when the order is placed. Table 4-1 lists the I/O domains and their related
I/O slots.
Table 4-1 I/O domains of I/O drawer
4.4 PCIe I/O drawer
The PCIe I/O drawers are attached to the CPC drawer through a PCIe bus and use PCIe as
the infrastructure bus within the drawer. The PCIe I/O bus infrastructure data rate is up to
16 GBps. PCIe switch application-specific integrated circuits (ASICs) are used to fan out the
host bus from the CPC drawers to the individual I/O features. Up to 64 channels (32 PCIe I/O
features) are supported versus the 32 channels (eight I/O features) that are offered with the
I/O drawer. The PCIe I/O drawer is a two-sided drawer (I/O cards on both sides) that is 7U
high. The drawer contains 32 I/O slots for feature cards, four switch cards (two in front, two in
the back), two DCAs to provide redundant power, and two air-moving devices (AMDs) for
redundant cooling.
Domain I/O slot in domain
A 02, 05, 08, and 10
B 03, 04, 07, and 11
I/O drawer – 8 slots
2 I/O domains
DCA 1
I/O-A
I/O-B
I/O-B
I/O-A
I/O-A
I/O-B
DCA 2
I/O-B
I/O-A
IFB-MP B
IFB-MP A
Front - 4
Rear - 4
RII
1
2
3
4
5
6
7
8
9
10
11
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