Table entries

An LU-mode table has two kinds of entries:

LU entries
Each LU entry holds information about a partner LU. The entries for all partner LUs for a specific LU are associated with each other. LU entries, once placed in the table, cannot be changed by APPCCMD QUALIFY=OPRCNTL, QUALIFY=DEFINE, or CNOS.
Mode entries
Each mode entry holds information about one mode associated with one partner LU. All the mode entries for the same partner LU are associated with each other, and the collection of mode entries is associated with the LU entry.

Figure 1 shows a conceptual view of the LU-mode table entry. Table 1 and Table 2 show how the session parameters are used for session activation.

Figure 1. Conceptual view of LU-mode table structure

The local LU has the possibility of establishing sessions with partner LU1 or partner LU2.

The session establishment with partner LU1 can use the session parameters specified in the logon mode table for Mode A, Mode B, or Mode C.

Table 1. Session establishment with partner LU1
Mode Group	Pool Size	Results (from the local LU's point of view)
A	4	One session is guaranteed to be a contention winner; two sessions are guaranteed to be contention losers. The unspecified session can be activated as a contention winner by either LU.
B	3	Two sessions are guaranteed to be contention winners; one session is guaranteed to be a contention loser.
C	2	One session is guaranteed to be a contention winner. The unspecified session can be activated as a contention winner by either LU.

The session establishment with partner LU2 can use the session parameters specified in the logon mode table for Mode A or Mode B.

Table 2. Session establishment with partner LU2
Mode Group	Pool Size	Results (from the local LU's point of view)
A	2	One session is guaranteed to be a contention winner; one session is guaranteed to be a contention loser.
B	3	One session is guaranteed to be a contention winner; two sessions are guaranteed to be contention losers.

Mode A can be defined in both partner LUs and have the same session limits or different session limits. Also, the mode names defined can be different for the partner LUs.