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CHAPTER 1 RCI Overview
Figure 1.4 shows a connection pattern that connects both duplicated and unduplicated
configurations.
Figure 1.4 Mixture of duplicated and unduplicated configurations
The pattern can contain RCI I/O units and RCI hosts that do not support a duplicated
configuration.
Connect them to the duplicate system. Connect RCI hosts that do not support a
duplicated configuration to the #0 system.
If an RCI host that does not support a duplicated configuration were already
connected, RCI I/O units would be connected to the #0 system.
Note: When an RCI host of the duplicated configuration is connected with RCI
hosts or RCI I/O units that do not support a duplicated configuration, it may
fail to control the RCI host or the RCI I/O unit on the #0 system in the
following case:
z When an XSCFU#0 failure generated an XSCF failover and the Active
XSCF Unit switched to XSCFU#1.
In this case, maintenance work of XSCFU#0 becomes necessary.
RCI host
RCI#0 RCI#0
I/O unit
RCI#0
RCI host
RCI#0
RCI#1
RCI#1
I/O unit
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