Note that SNA Server supports LU groups; a group consists of a number of LUs of the same type (3270 display LUs or LUA LUs) such that any of the LUs in the group can be used for the same task.
If an application sends an Open(SSCP) Request specifying the name of a 3270 display LU group, the local node can select any LU within the group to be used by the application. LUA LU groups are used in the same way, except that the application can specify either the name of the group or the name of any LU within the group to access the group.