IBM Power 595, Технический обзор и введение

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Chapter 2. Architectural and technical overview
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Figure 2-15 Power 595 64 core
2.2.2 I/O subsystem
The Power 595 utilizes remote I/O drawers for directly attached PCI or PCI-X adapters and
disk capabilities.The 595 supports I/O DASD and media drawers through Remote I/O (RIO),
High Speed Loop (HSL), and 12x Host Channel Adapters (HCA) located in the front of the
processor books. These are collectively referred to as
GX adapters
.
Two types of GX adapter cards are supported in the 595 servers:
Remote I/O-2 (RIO-2) dual port Loop Adapter (#1814)
GX dual port 12x HCA adapter (#1816)
Drawer connections are always made in loops to help protect against a single point-of-failure
resulting from an open, missing, or disconnected cable. Systems with non-looped
configurations could experience degraded performance and serviceability.
RIO-2 loop connections operate bidirectional at 1 GBps (2 GBps aggregate). RIO-2 loops
connect to the system CEC using RIO-2 loop attachment adapters (#1814). Each adapter has
two ports and can support one RIO-2 loop. A maximum of four adapters can be installed in
each 8-core processor book.
The 12x loop connections operate bidirectional at 3 GBps (6 GBps aggregate). 12x loops
connect to the system CEC using 12x loop attachment adapters (#1816). Each adapter has
two ports and can support one 12x loop.
Note: RIO and HSL describe the same I/O loop technology. RIO is terminology from
System p and HSL is terminology from System i.