Resetting generic LU information
If you use a generic LU name to connect to a member of a data sharing group that is using two-phase commit, VTAM® permanently records information in the coupling facility about which member of the group was involved in the communication.
This permanently recorded information is required to guarantee that future VTAM sessions are always directed to the same member, making it possible to provide access to the correct member log for resolution of indoubt threads.
At times, you might need to break that affinity between the member and the other system. You would need to do this, for example, if you want to use member-specific access, or if you want to remove a member from the data sharing group.
To break this affinity, issue the RESET GENERICLU command from an active member of the data sharing group. You must issue this command from the member with the VTAM affinity to the particular LU. Here is an example of a command that removes information about USIBMSTODB22 from DB1A:
-DB1A RESET GENERICLU(LUDB22)
Take great care when using this command because it can potentially cause the specified partner LUs to connect to different members on later sessions. This can cause operational problems if indoubt threads exist at a partner LU when this command is issued.