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         A Brief History
Future I/O (FIO) was being developed by IBM, Compaq
Computer, Hewlett-Packard, 3Com, Adaptec, and Cisco.
Next Generation I/O (NGIO) was being developed by Intel, Dell
Computers, Sun, and others.
FIO and NGIO were competing technologies
Neither would “win” so they combined forces to form Serial I/O
(SIO) which combined the best of both technologies
The name SIO could not escape the powerful clutches of the
Intel Marketing department and hence was renamed
InfiniBand Architecture or IBA for short
What is InfiniBand?

A technology used to interconnect
processing nodes to I/O nodes to form a
System Area Network
Intended to be a replacement for PCI
Heavily leverages best-of-breed
     The Problem
  The need for a cost-effective interconnect
technology for building clusters.
  Bus-based architectures (i.e. PCI) are limited to a
single host system and cannot easily extend
beyond the confines of the “box”.
  Bandwidth and Latency between boxes using
existing system area networks are limited and/or
This suggests that I/O interconnects need to
radically change every few years in order to
maintain system performance.
  The Solution - InfiniBand

Network-based Architecture
Serial communication technology
Supported by a very large consortium – 220
members in the IBTA to date
Targets a volume market in order to take
advantage of economies of scale
InfiniBand System Fabric
Areas of Operation

Application Clustering

Storage Area Networks

Inter-Tier communication

Inter-Processor Communication (IPC)
I/O Architectures –
Shared Bus Architecture
I/O Architectures –
Switched Fabric Architecture
InfiniBand Technical
Layered Protocol - Physical, Link, Network, Transport,
Upper Layers
Packet Based Communication
Three Link Speeds IX-2.5 Gb/s, 4 wire
4X - 10 Gb/s, 16 wire   12X - 30 Gb/s, 48 wire
Subnet Management Protocol
Remote DMA Support
Multicast and Unicast Support
Reliable Transport Methods - Message Queuing
Communication Flow Control - Link Level and End to End
InfiniBand Layers
InfiniBand Architecture
InfiniBand Elements

 Channel Adapters
 Subnet Manager
 InfiniBand Support for the
Virtual Interface Architecture
The collective effort of industry leaders has
successfully transitioned InfiniBand from
technology demonstrations to the first real
product deployments.
The IBTA has a vision to improve and simplify
the data center through InfiniBand technology
and the fabric it by creating an interconnect for
servers, communications and storage.
             Thank You!

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