HP XP Racks - Manual (Page 744)

For operation in this configuration, define command devices separately for the route in the forward
direction and the route in the reverse direction so that a command device cannot be shared, and
specify different APIDs for each direction.
Configuration for which another host uses a command device in a route
As shown in the following figure, a command device cannot be shared in a configuration in which
another host uses the command device in the route.
For operation in this configuration, define different command devices for each host so that a
command device cannot be shared, and specify a separate APID for each command device.
Configuration for N:1 communication between command devices in multiple storage
systems and a command device
As shown in the following figure, a command device cannot be shared in a configuration for N:1
communication between command devices in multiple storage systems and a command device.
744 About configurations for which the same command device is shared from multiple hosts