9035 ESCON converter considerations

For the 3990, 9035 configuration requires special Vital Product Data (VPD) specification. When an ESCON Director blocks a port supporting a 9035 or prohibits a dynamic connection between the channel attached to the 9035 and the control unit, the logical path is removed from the 3990. This path is now available to other channels: either to another 9035 configured in the VPD or to channels not attached to a 9035 that try to establish a logical path. The 3990 always tries to establish a logical path to the 9035s configured in the VPD before it allows a channel not attached to a 9035 to have a logical path.