CP6100 I/O Process Programming Manual

Using CP6100: Managing Lines
To switch control of a set of lines to the other controller,
without switching control to the other CPU, you give either one
or two commands in sequence, depending on the configuration:
• If both controllers in the subsystem are currently owned by
the same CPU, give the ALTER PROCESS command with the PATH
option. That command switches not only the line you name, but
also all other lines controlled by the same I/O process.
• If the controllers in the subsystem are currently owned by
different CPUs, use the ALTER CIU command with the CPU option,
as described above. The command switches all lines on that
controller to the other CPU; it also switches the CSM if you
specified path A. (Now all lines attached to the subsystem
are controlled from the same CPU.) Then use the ALTER PROCESS
command with the PATH option. That command switches the line
you name, as well as all lines controlled by that process, to
the other controller.
Figures 3-5a and 3-5b illustrate these operations.
October 1985
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