Multipath channel connection for host A17N

The channel-attachment major node example that follows defines two multipath channel connections for host A17N, as illustrated in Figure 1.

The VBUILD definition statement defines the beginning of this channel-attachment major node (TYPE=CA).

The first GROUP definition statement defines the transmission group MPCG1 between hosts A17N and A500N as a multipath channel connection (LNCTL=MPC). The LINE definition statement that follows defines the read and write subchannel addresses for the transmission group. READ=(BC1) defines BC1 as the read subchannel address for that transmission group. This address corresponds to the WRITE subchannel address shown for transmission group MPCG1 in the channel-attachment major node for host A500N. WRITE=(BC2) defines BC2 as the write subchannel address for that transmission group. This address corresponds to the READ subchannel address shown for transmission group MPCG1 in the channel-attachment major node for host A500N. The READ subchannel address and the corresponding WRITE subchannel address must reference the same physical connection between the two nodes; the two addresses do not need to be identical.

*  =====> BEGINNING OF DATA SET MPCCTC17
*************************************************
* CHANNEL-ATTACHMENT MAJOR NODE FOR MPC         *
*************************************************
MPCCTC  VBUILD TYPE=CA,           ** CHANNEL ATTACHMENT MAJOR NODE **  X
               CONFGDS=CTC1CKP    ** CONFIGURATION RESTART DATASET **
MPCG1   GROUP  LNCTL=MPC,         ** MULTIPATH CHANNEL CONNECTION  **  X
               MAXBFRU=16,        ** READ SUBCHANNEL BUFFER SIZE   **  X
               ISTATUS=ACTIVE,    ** BECOMES ACTIVE WITH MAJOR NODE**  X
               REPLYTO=3.0        ** TIMEOUT VALUE FOR MPC XID I/O **
MPCCTC1 LINE   READ=(BC1),        ** SUBCHANNEL ADDRESS FOR READ   **  X
               WRITE=(BC2)        ** SUBCHANNEL ADDRESS FOR WRITE  **
MPCPU1  PU     PUTYPE=4,TGN=1     ** LINK STATION FOR ADJACENT HOST**
*
MPCG2   GROUP  LNCTL=MPC,         ** MULTIPATH CHANNEL CONNECTION  **  X
               MAXBFRU=16,        ** READ SUBCHANNEL BUFFER SIZE   **  X
               ISTATUS=ACTIVE,    ** BECOMES ACTIVE WITH MAJOR NODE**  X
               REPLYTO=3.0        ** TIMEOUT VALUE FOR MPC XID I/O **
MPCCTC2 LINE   READ=(BC4),        ** SUBCHANNEL ADDRESS FOR READ   **  X
               WRITE=(BC5)        ** SUBCHANNEL ADDRESS FOR WRITE  **
MPCPU2  PU     PUTYPE=4,TGN=2     ** LINK STATION FOR ADJACENT HOST**
*
*  =====> END OF DATA SET MPCCTC17