the case of Fibre Channel I/O adapters, these ports are Fibre Channel ports.)
Each port attaches to a serial-transmission medium that provides duplex
communication with the node at the other end of the medium. You can
configure your network structure that is based on one of three basic
interconnection topologies (network structures):
– Point-to-point and switched fabric
– Fibre Channel arbitrated loop
– Fibre Channel (FICON). This connection does not apply to open systems.
See the IBM DS8000 Host Systems Attachment Guide for more information about
these supported topologies.
v The maximum distance between a shortwave host adapter Fibre Channel port
and the following network components is 380 meters (1,246 ft 9 in.) at 4 Gbps,
150 meters (492 ft 2 in.) at 8 Gbps, and 100 meters (328 ft 1 in.) at 16 Gbps. For a
longwave host adapter Fibre Channel port, the maximum distance is 10 km (6.2
miles).
– Fabric switches
– Fabric hubs
– Link extenders
– Storage system Fibre Channel port
The maximum distance might be greater than 10 km (6.2 miles) when a link
extender provides target initiator functions or controller emulation functions.
Note: Do not use link extenders with emulation functions on links over which
Remote Mirror and Copy operations are performed. Link extenders with
emulation functions introduce more path delay.
v Because the Fibre Channel architecture allows any channel initiator to access any
Fibre Channel device, without access restrictions, a security exposure can occur.
Have your technical service representative set the Fibre Channel access modes to
the correct setting. See the IBM DS8000 Host Systems Attachment Guide for more
information about Fibre Channel access modes.
v Storage systems can connect to IBM SAN Volume Controller host systems. See
the IBM DS8000 Host Systems Attachment Guide for more information.
Attention: Signal-loss tolerance for Fibre Channel links that run at 8 or 16 Gbps
are reduced by -1.4 dB as compared to links that run at 4 Gbps. Take necessary
steps to ensure that links are within the signal-loss parameters that are listed when
you plan a move from 4 Gbps FC to 8 or 16 Gbps FC adapters with existing
infrastructure. Using more than two patch panels or other link connectors between
two 8 or 16 Gbps ports at maximum distance of 10 km might result in greater link
loss than is acceptable. Signal loss tolerance with measurements, including all
connectors and patch panel connections, are:
v Loss per 10 km for 16 Gbps speed is -6.4 dB.
v Loss per 10 km for 8 Gbps speed is -6.4 dB.
v Loss per 10 km for 4 Gbps speed is -7.8 dB.
OM3 Fibre Channel cables are required to support 8 Gbps host adapters.
Chapter 6. Delivery and installation requirements 171
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