90 IBM Power 770 and 780 (9117-MMD, 9179-MHD) Technical Overview and Introduction
Each disk bay set can be attached to its own controller or adapter. The feature PCIe 12X I/O
drawer has four SAS connections to drive bays. It connects to PCIe SAS adapters or
controllers on the host systems.
For detailed information about how to configure, see the IBM Power Systems Hardware
Information Center:
http://publib.boulder.ibm.com/infocenter/powersys/v3r1m5/index.jsp
2.10.4 12X I/O Drawer PCIe and PCI-DDR 12X Expansion Drawer 12X cabling
I/O drawers are connected to the adapters in the CEC enclosure with data transfer cables:
12X DDR cables for the FC 5802 and FC 5877 I/O drawers
12X SDR, DDR cables, or both for the FC 5796 I/O drawers
The first 12X I/O drawer that is attached in any I/O drawer loop requires two data transfer
cables. Each additional drawer, up to the maximum allowed in the loop, requires one
additional data transfer cable. Note the following information:
A 12X I/O loop starts at a CEC bus adapter port 0 and attaches to port 0 of an I/O drawer.
The I/O drawer attaches from port 1 of the current unit to port 0 of the next I/O drawer.
Port 1 of the last I/O drawer on the 12X I/O loop connects to port 1 of the same CEC bus
adapter to complete the loop.
Figure 2-29 shows typical 12X I/O loop port connections.
Figure 2-29 Typical 12X I/O loop port connections
Table 2-25 shows various 12X cables to satisfy the various length requirements.
Table 2-25 12X connection cables
Feature code Description
1861 0.6-meter 12X DDR cable
1862 1.5-meter 12X DDR cable
1865 3.0-meter 12X DDR cable
1864 8.0-meter 12X DDR cable
I/O I/O
10
I/O
10
I/O
10
I/O
10
C
0
1
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