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IBM Power 750 and 760 Technical Overview and Introduction
2.9 External I/O subsystems
The Power 750 and Power 760 server support the attachment of I/O drawers. Any
combination of the following two I/O drawers can be attached to the system unit, providing
extensive capability to expand the overall server.
12X I/O Drawer PCIe, small form factor (SFF) disk (FC 5802)
12X I/O Drawer PCIe, No Disk (FC 5877)
Two GX++ slots are enabled in a system unit if two or more processor DCMs are installed. An
optional GX++ 12X DDR Adapter, Dual-port (FC 1808) is available, which is installed in a
GX++ adapter slot and enables the attachment of a 12X loop, which runs at DDR speed.
Table 2-23 provides an overview of all the supported I/O drawers.
Table 2-23 I/O drawer capabilities
2.9.1 PCI-DDR 12X expansion drawer
The PCI-DDR 12X Expansion Drawer (FC 5796) is not supported with the Power 750 and
Power 760 server.
2.9.2 12X I/O Drawer PCIe
The 12X I/O Drawer PCIe, SFF disk (FC 5802) is a 19-inch I/O and storage drawer. It
provides a 4U (EIA units) drawer containing 10 PCIe-based I/O adapter slots and 18 SAS
hot-swap small form factor (SFF) disk bays, which can be used for either disk drives or SSD
drives. Using 900 GB disk drives, each I/O drawer provides up to 16.2 TB of storage. The
adapter slots within the I/O drawer use Gen3 blind swap cassettes and support hot-plugging
of adapter cards. The 12X I/O Drawer PCIe, No Disk (FC 5877) is the same as FC 5802
except that it does not support any disk bays.
A maximum of two 12X I/O Drawer PCIe, SFF disk drawers can be placed on the same 12X
loop. Within the same loop FC 5877 and FC 5802 can be mixed. An upgrade from a diskless
FC 5877 to FC 5802 with disk bays is not available.
A minimum configuration of two 12X DDR cables, two AC power cables, and two SPCN
cables is required to ensure proper redundancy. The drawer attaches to the system unit with a
12X adapter in a GX++ slot through 12X DDR cables that are available in the following
various cable lengths:
0.6 meters 12X DDR Cable (FC 1861)
1.5 meters 12X DDR Cable (FC 1862)
3.0 meters 12X DDR Cable (FC 1865)
8.0 meters 12X DDR Cable (FC 1864)
Feature
code
Disk drive bays
PCI slots
Requirements for
Power 750 and Power 760
5802
18 SAS hot-swap disk
drive bays
10 PCIe
GX++ adapter card
(FC 1808 CCIN 2BC3)
5877
None
10 PCIe
GX++ adapter card
(FC 1808 CCIN 2BC3)
Unsupported: The 12X SDR cables are not supported.