The network
interfaces used must support DLPI (link level).
There must be less than 200 milliseconds of latency in the network between
the data centers.
No routing is allowed for the networks between the data centers.
The maximum distance supported between the data centers for DWDM
configurations is 100 kilometers.
Both the networking and Fibre Channel Data Replication can go through
the same DWDM box - separate DWDM boxes are not required.
Since DWDM converters are typically designed to be fault tolerant,
it is acceptable to use only one DWDM box (in each data center)
for the links between each data center. However, for the highest availability,
it is recommended to use two separate DWDM boxes (in each data center)
for the links between each data center. If using a single DWDM
box for the links between each data center the redundant standby
fibre link feature of the DWDM box must be configured. If the DWDM
box supports multiple active DWDM links, that feature can be used
instead of the redundant standby feature.
At least two dark fibre optic links are required between each Primary
data center, each fibre link routed differently to prevent the "backhoe
problem." It is allowable to have only a single fibre link routed
from each Primary data center to the third location, however in
order to survive the loss of a link between a Primary data center and
the third data center, the network routing should be configured so
that a Primary data center can also reach the Arbitrator via a route
passing through the other Primary data center.
The network switches in the configuration must support DLPI (link level)
packets. The network switch can be 100BaseT (TX or FX), 1000BaseT
(TX or FX) or FDDI. The connection between the network switch and
the DWDM box must be fibre optic.
FibreChannel switches must be used in a DWDM configuration; FibreChannel
hubs are not supported. Direct Fabric Attach mode must be used
for the ports connected to the DWDM link.
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