as/vs responds with a "SPECIFY SYSTEK PARAMETERS" message. The proper
use of a system Farameter list (IEASYSOO or IEASYSxx), created during or
subsequent tc the as/vs system generation process, can result in a
significant saving of time. Commonly used operator commands can be
placed in the SYS1.PARKLIB data set to shorten the IPt process. OS/VS Operation
To control OS/VS, use OS/VS operator commands to hold and release queues
and jobs and to start initiators or define partitions. Users can
otserve the progress of the command's execution by following the as/vs
messages. Figure 18 shows how VK/370 loads VS1 in a virtual machine.
r-------------------------------------------------------------------------, LOGON AT 01:96: 14 EST WEDNESDAY 10/29/75 def stor 3012k STORAGE = 03072K q set MSG ON , iNG ON , EMSG TEXT , ACNT ON , RUN OFF LINEDIT ON , TIMER REAL , ISAM OFF , ECMODE ON ASSIST ON SVC , PAGEl OFF , AUTOPOLL OFF IMSG ON , AFFINITY OFF def 009 01f CONS 01F DEFINED
q chan CHANNELS = SEL def chan blRx CHANNELS = BMX The virtual selector channels have been redefined
to block multiplexer. This is a performance
consideration to improve the of I/O operations. To avoid issuing the CP DEFINE command, the VM/370 directory entry can specify
the BMX option in the OPTION control statement.
Figure 18. Sample IPL of VS1 under VM/370 (Part 1 of 2) i30 IBM VM/370 operating Systems in a virtual Machine

r-------------------------------------------------------------------------, IEE140I SYSTEM CONSOLES CONSOLE/ALT COMD lUTH ID 01F/01F MALL 01 IEF0311 SYSGEN VALUES TAKEN FOR JES IEFS66I DEFINE COMMAND BEING PROCESSED ROUTCP 1-10,10-16 IEE8041 PO=(C=AOB,576'K,A,I) ,P1=(C=AOB,576K,A,E,LAST), IEES04I P2=(INACTIVE) ,P3=(INACTIVE), IEES04I P4=(INACTIVE) ,P5=(INACTIVE), IEE804I P6=(INACTIVE) ,P7=(INACTIVE), IEE543I 250K BYTES FREE SPACE IEE817I TMSL=NONE IEE805I DEFINITION COMPLETED IEE101A READY IEE009I JLPRM=(U) IEE050I MN JOBNAMES,T IEE04SI INITIALIZATION COMPLETED -
Figure 18. Sample IPL of VS1 under VM/370 (Part 2 of 2) When using CMS, initial operator commands can be incorporated into a CMS EXEC procedure as part of the job stream. For example: To create
the following EXEC procedure called SETUPVS, issue these commands:
CP LINK VSSYS 250 250 RR OSPASS CP DEFINE 009 AS 01F CP IPL 250 After starting the appropriate as/vs readers, the virtual machine is ready to receive input from card readers, DASD, or tape drives. COMMUNICATING WITH CP
During as/vs virtual machine operation, a user can issue CP commands to
(1) communicate with the VM/370 system operator or other virtual
machine users, and (2) query and alter the status of the configuration
and spool files. In general, a user can enter any of the CP commands
normally permitted under his userid's privilege class.
Entering CP commands while an OS/VS virtual machine is running
depends on the terminal mode (as defined by the CP TERMINAL command or
its default value). When not running as the VM/370 system operator, the
default terminal mode is VM. In this mode, pressing the attention key
(er its equivalent) once passes an interruption pending condition to the
as/vs virtual .achine. pressing the attention key twice places the
virtual machine in the CP command environment from which CP commands
can be entered. For a complete description about how to use the
attention key, refer to £R !2£ Section 4. as/vs in a Virtual Machine 131