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4939H29
8068ch11-SAN Config.fm
Draft Document for Review January 29, 2013 12:52 pm
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IBM Flex System V7000 Storage Node Introduction and Implementation Guide
System Enterprise Chassis the compute nodes are the initiators with IBM Flex System V7000
Storage Node being the target.
Storage Node being the target.
Fibre Channel architecture is extremely flexible in its potential application. Fibre Channel
transport layers are protocol independent, enabling the transmission of multiple protocols.
transport layers are protocol independent, enabling the transmission of multiple protocols.
Using a credit based flow control methodology, Fibre Channel is able to deliver data as fast as
the destination device buffer is able to receive it. And low transmission overheads enable high
sustained utilization rates without loss of data. Therefore, Fibre Channel combines the best
characteristics of traditional I/O channels with those of computer networks such as within the
IBM Flex System Enterprise Chassis.
the destination device buffer is able to receive it. And low transmission overheads enable high
sustained utilization rates without loss of data. Therefore, Fibre Channel combines the best
characteristics of traditional I/O channels with those of computer networks such as within the
IBM Flex System Enterprise Chassis.
Fibre Channel Layers
Fibre Channel (FC) is broken up into a series of five layers. The concept of layers, starting
with the ISO/OSI seven-layer model, allows the development of one layer to remain
independent of the adjacent layers. Although, FC contains five layers, those layers follow the
general principles stated in the ISO/OSI model.
with the ISO/OSI seven-layer model, allows the development of one layer to remain
independent of the adjacent layers. Although, FC contains five layers, those layers follow the
general principles stated in the ISO/OSI model.
The five layers can be categorized into two:
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Physical and signaling layer
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Upper layer
Fibre Channel is a layered protocol. as shown in Figure 11-18, which can be compared to
Figure 11-8 on page 443 where the FC layer can be seen to be encapsulated within the FCoE
stack.
Figure 11-8 on page 443 where the FC layer can be seen to be encapsulated within the FCoE
stack.
Figure 11-18 Upper and physical FC Layers
Physical and signaling layers
The physical and signaling layers include the three lowest layers: FC-0, FC-1,and FC-2.
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Physical interface and media: FC-0
– The lowest layer, FC-0, defines the physical link in the system, including the cabling,
connectors, and electrical parameters for the system at a wide range of data rates. This
level is designed for maximum flexibility, and allows the use of a large number of
technologies to match the needs of the configuration.
level is designed for maximum flexibility, and allows the use of a large number of
technologies to match the needs of the configuration.
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Transmission protocol: FC-1
– The second layer, FC-1 provides the methods for adaptive 8B/10B encoding to bind the
maximum length of the code, maintain DC-balance, and provide word alignment. This