Page of GC20-1801-10 As Updated April 1, 1981 by TNL GN25-0837 St arter Systems If you respond "yes" to this question, you are prompted to enter the
amount of storage you wish to reserve in the CP nucleus for a
virtual=real machine. (Part 1. "Planning for System Generation"
contains formulas to help you determine how much storage you need to
reserve. )
To generate a V=R system of size !M (megabytes), in the
format nnnnk. nnnnk must be a mUltiple of 1024K. For example, to
indicate 3M you should specify 3072K. The minimum size you can specify
is 32K. The maximum specifiable size is 15360K. A "yes" response displays the following messa ges: STORAGE SIZE OF VIRT=REAL (MINIMUM IS 32K): 100k 0100K STORAGE SIZE FOR VIRTUAL=REAI, IS THE ABOVE ENTRY CORRECT (YES, NO) :
ves
If you respond "no" to this message, the following message is displayed:
FILE 'DMKSLC TEXT A1' NOT FOUND You must have enough virtual storage available to generate the CP nucleus with a virtual=real area. If you do not have enough virtual
storage available, redefine stcrage for your virtual machine. Step 18. Load the CP Nucleus Once you respond to the virtual=real generation questions, the GENERATE EXEC procedure builds and writes the CP nucleus on tape. To do this,
GENERATE first issues the the VMFLOAD command to punch the loader and CP object modules to a virtual punch spool file. Then GENERATE transfers
this file to the virtual card reader file and writes the file on tape.
GENERATE issues the following messages during the processinq:
hh:mm:ss NO FILES PURGED SYSTEM LOAD DECK COMPLETE hh:mm:ss PUN FILE nnnn TO CPGEN COPY 01 NOHOLD IPLABLE NUCLEUS NOW ON TAPE **** If any errors are detected while the tape is being written, you
must recreate the CP nucleus. To do this, issue the command:
generate cp nucleus
The procedure restarts at Step 17 where
virtual=real option and support for
followinq message is issued:
you are asked if you want the
the Attached Processor. The
THE NUCLEUS LOAD MAP MUST BE SAVED ON DISK FOR IPCS. WHEN 'NUCLEUS LOADED ON XXXXXX' IS TYPED, ISSUE 'CLOSE PRT' AND IPL CMS AND READ IN THE LOAD MAP. IT WOULD BE EXPEDIENT TO LOAD IT ON AN AREA ACCESSIBLE TO THE IPCS VIRTUAL MACHINE. FOLLOWING THIS, THE NEW SYSTEM MAY BE IPL'ED. Part 3. Generating VM/370 (CP, CMS, RSCS, and IPCS) 247

Apr1l 1, starter Systems When the nucleus is written on your system residence volume, the
resultant load map is placed in your virtual reader by the CLOSE PRT command. This load map should be read in as a uniquely named CMS file.
After the new system is operational, the disk-resident load map is
required for IPCS. If you have limited space available on the starter system minidisks, read the load map onto the CMS system disk (190). Issue the following commands:
link cmssys 190 190 w write
access 190 a
read cpnuc loadmap
LOADING A CP NUCLEUS WITHOUT A VIRTUAL=REAL AREA
If you responded "no" when asked if you wanted the virtual=real area,
the GENERATE EXEC procedure builds the CP nucleus, writes it to tape,
and loads it from the tape. When the nucleus is written on the system residence volume, the message NUCLEUS LOADED ON volid
is issued, where volid is the volume serial number of your system
residence volume. The volid is the serial number you specified on the SYSRES macro when you prepared the CP system control file (DMKSYS). If
you followed the example in this manual, the serial number of your
system residence volume is VMRELn. The CP load map is placed in the virtual reader of CPGEN. This load
map should be read in as a uniquely named CMS file. After your new system is operational, the disk resident load map is required for IPCS. To save the load map, issue the following commands:
close prt
ipl 190 parm seg=null
access 194 a
read cpipcs map a
If you wish, edit or print the load map. The contents of the load
map are described in Part 5. "Updating VM/370". You may now drain all spooling devices and shut down the system by
entering:
drain all
shutdown
If an error occurs, and you do not receive the "NUCLEUS LOADED ON volid" message, issue the commands
cp spool prt off
close printer
to allow the error load map to be printed and examine the listing of the
load map_ A loader error may be indicated. See the Me§§ggg§ for a list of the loader wait state codes.
248 IB' VM/370 Planninq and System Generation Guide