Specifications

90 IBM Power 770 and 780 Technical Overview and Introduction

Each disk bay set can be attached to its own controller or adapter. The feature #5802 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 #5802 and #5877 I/O drawers

򐂰 12X SDR and/or DDR cables for the #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 2-32 shows typical 12X I/O loop port connections.

Figure 2-32 Typical 12X I/O loop port connections

Table 2-31 shows various 12X cables to satisfy the various length requirements.

Table 2-31 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

I/O