HP 3000 Manuals HP 3000 Manuals
Improved Recovery of APPC SUBSYSTEM/XL by Ron Lawson--Information Networks Division The APPC subsystem is enhanced and provides better recovery of Logical Units (LUs). Previously, only LUs that were involved in ACTIVE LU-to-LU sessions with a host would recover after certain events, such as a link failure. LUs that were in a PENDING state waiting for activation by the host would not recover. The set of events that are considered recoverable now includes link failures and host-initiated session deactivation (unbinds). When such an event is recognized, each LU will stop any active conversation, terminate, then restart. This will allow the APPC subsystem to remain active. One example of how this functionality is useful is when the HP 3000 is configured to wait for a phone call from the host to conduct an LU 6.2 conversation. After the conversation is completed, the host "hangs up," causing a perceived link failure. Now instead of terminating, the APPC subsystem will recover and wait for another conversation to begin.