IBM Power 770, Technical Overview And Introduction

Page: 99 / 220

Chapter 2. Architecture and technical overview
85
Because the integrated SAS controller is independent from the two SAS disk or SSD
controllers, it allows the DVD to be switched between multiple partitions without impacting the
assignment of disks or SSDs in the CEC enclosure.
2.10 External I/O subsystems
This section describes the external 12X I/O subsystems that can be attached to the
Power 770 and Power 780, listed as follows:
򐂰 PCI-DDR 12X Expansion Drawer (FC 5796)
򐂰 12X I/O Drawer PCIe, small form factor (SFF) disk (FC 5802)
򐂰 12X I/O Drawer PCIe, No Disk (FC 5877)
Table 2-23 provides an overview of all the supported I/O drawers.
Table 2-23 I/O drawer capabilities
The two GX++ buses from the second processor card feed two GX++ adapter slots. An
optional GX++ 12X DDR Adapter, Dual-port (FC 1808), which is installed in GX++ adapter
slot, enables the attachment of a 12X loop, which runs at either SDR or DDR speed,
depending on the 12X I/ O drawers that are attached.
2.10.1 PCI-DDR 12X Expansion Drawer
The PCI-DDR 12X Expansion Drawer (FC 5796) is a 4U (EIA units) drawer and mounts in a
19-inch rack. It is 224 mm (8.8 in.) wide and takes up half the width of the 4U (EIA units) rack
space. The 4U enclosure can hold up to two PCI-DDR 12X Expansion Drawer drawers
mounted side-by-side in the enclosure. The drawer is 800 mm (31.5 in.) deep and can weigh
up to 20 kg (44 lb).
The PCI-DDR 12X Expansion Drawer has six 64-bit, 3.3 V, PCI-X DDR slots, running at
266 MHz, that use blind-swap cassettes and support hot-plugging of adapter cards. The
drawer includes redundant hot-plug power and cooling.
Two interface adapters are available for use in the drawer:
򐂰 Dual-Port 12X Channel Attach Adapter Long Run (FC 6457 CCIN 520A)
򐂰 Dual-Port 12X Channel Attach Adapter Short Run (FC 6446 CCIN 520B)
The adapter selection is based on how close the host system or the next I/O drawer in the
loop is physically located. The drawer attaches to a host system CEC enclosure with a 12X
adapter in a GX++ slot through SDR or DDR cables (or both SDR and DDR cables). A
maximum of four drawers can be placed on the same 12X loop. Mixing drawers as FC 5802,
FC 5877, and FC 5796 on the same loop is not supported.
Feature
code DASD PCI slots Requirements for the
Power 770 and Power 780
5796 0 6 x PCI-X GX++ adapter card
(FC 1808 CCIN 2BC3)
5802 18 x SAS disk drive bays 10 x PCIe GX++ adapter card
(FC 1808 CCIN 2BC3)
5877 0 10 x PCIe GX++ adapter card
(FC 1808 CCIN 2BC3)