Defining the MAS™ to VSE or VM

The MAS connects to an ESCON Channel of an IBM (or compatible) mainframe.  Before you can use the MAS you must configure the operating system to recognize the newly attached MAS.

Overview

The MAS supports up to 32 subchannel addresses per channel, though your application may use fewer.  To allow for maximum growth without having to redo the I/O configuration, we suggest you configure all 32 subchannel addresses on the mainframe at the time of the initial installation even if you don't plan to use them all at first.

Connecting the MAS to an ESCON Channel

The MAS can be connected directly to the mainframe using ESCON or it can be connected through an ESCON director.  I/O generation examples for both kinds of connections are shown below.

In either case, to properly define a MAS virtual tape device, the following parameters are required:

TYPE must be CNC.

UNIT can be either 3480 or 3490.

The CHPID can be defined as any one of the following - SHARED, DED or REC.

Configuration for a simple ESCON connection

    CHPID PATH=(0A),SHARED,TYPE=CNC

    CNTLUNIT CUNUMBR=A80,PATH=(0A),                      +
             UNITADD=((00,32)),UNIT=3480

    IODEVICE ADDRESS=(A80,32),CUNUMBR=(A80),             +
             STADET=Y,UNIT=3480

    

Configuration for an ESCON Director in Basic Mode

    CHPID PATH=((22)),TYPE=CNC,SWITCH=02

    CNTLUNIT CUNUMBR=300,PATH=(22),LINK=(C2),            +
             UNITADD=((00,32)),UNIT=3480

    IODEVICE ADDRESS=(300,32),CUNUMBR=(300),UNIT=3480