Loading and Saving Discontiguous Saved Segments You are prompted to enter the release level of the DOS/VS starter
system you are using: ENTER RELEASE OF THE DOS/VS STARTER SYSTE": Enter 34. If you enter an unsupported release number, you receive the
message INVALID - RELEASE 31 OR LATER REQUIRED an d the VS AMGEN EXEC procedure is terminated.
You are now prompted to indicate whether you want to install VSA" or
access method services or both: D"SVGN264R ENTER OR 'CMSA"S' OR 'BOTH' FOR GENERATION OF l1EW SY STEM (S) If you receive the message: INPUT FILE 'VSA"33 DOSLNK *' NOT FOUND the probable cause is that the system disk is not accessed as a
read-only extension of your A-disk.
Next, VSA5GEN issues a message asking you to identify the DOS system
relocatable library: DMSVGN362R ENTER "ODE OF DOS RELOCATABLE LIBRARY DISK: Respond with the filemode of the DOS/VS starter system disk, which you
linked to and accessed before invoking VSAMGEN. If the filemode you
enter is not the filemode of a DOS disk, you receive an error message
and VSAMGEN processing is terminated. DISK 'fm' IS NOT A DOS DISK. The System Name Table provided with the VM/370 Starter System was created assuming DOS/VS Release 34. VSAAGEN checks that the files it requires are on an accessed disk;
these required files are shipped on the CMS system disk. VSAftGEN next
invokes the environment and makes the DOS/VS starter system disk
available as the DOS/VS system residence volume.
For as users only, invokes the RSERV command and creates CftS text files for all the required VSAft and access method services modules
in the DOS/VS relocatable library. The as users of VSAft and access
method services thus are not required to keep the DOS/VS starter system
disk. as users can update and access method services directly on
the CMS A-disk. as users receive the following messages: CREATING TEXT FILES ••• TEXT FILES CREATED ON DISK 'A'.
For both OS and DOS users, VSAMGEN then link-edits the VSAM modules
and places them in a CMS phase library called DOSLIB. At this
time you receive the following information messages: DMSVGN3621 LINK-EDITING CMSVSAM ••• DOSLIB CREATED ON DISK 'A'. Part 3. Generating Vft/370 (CP, RSCS, and IPCS) 273

Loading and Saving Discontiguous Saved Segments Note that DOS linkage editor messages (if they occur) are written to
the virtual console as well as the linkage editor map during VSAMGEN processing. Information messages (I-level, return code = 4) may occur
due to phase construction and will not cause the EXEC to terminate
execution.
Next you must respond to the VSAMGEN message: DMSVGN370R ENTER 'GO' IF SAVED SYSTEM IS TO BE CREATED, OTHERWISE 'QUIT' At this time the DOSLIB has been created and if you do not require
the link-edit listing, enter 'GO'. However, if you desire to modify the VSAM or AMS systems, enter 'QUIT'. This will preserve the DOSLIB on
your A-disk and you can wait until you have the link-edit listing before
continuing. If you responded 'BOTH' to message DMSVGN264R, the EXEC will then create the CMSAMS DOSLIB. When you are ready to continue,
invoke the VSAMGEN EXEC and reply RESTART to the message: DMSVGN360R ENTER 'INSTALL', 'UPDATE' OR 'RESTART'
making sure that the required DOSLIBs are on your A-disk and reply to
the succeeding messages as before.
Next you must respond to a VSAMGEN message and enter the load address
for CMSVSAM. This address must be entered in hexadecimal characters; it
must be an address beyond the size of the virtual machines that will
attach it. The prompting message is: DMSVGN363R ENTER LOCATION WHERE CMSVSAM WILL BE LOADED AND SAVED: If your installation DMKSNT was defined to be identical to the example
shown in Figure 31 you would enter: 110000 (1088K). If you enter the
load address incorrectly, you receive the message: DMSVGN360E INVALID RESPONSE 'location'. VSAMGEN fetches the VSAM modules and loads them at the address you
specified. You receive the message:
followed by messages from the FETCH command describing the entry point
of the modules being fetched. Now the message: DMSVGN371R system IS LOADED, IF ZAPS ARE TO BE APPLIED GO INTO 'Cpt MODE, ELSE 'NULL' is issued. The system has been loaded into the location requested and
if no modifications are required press the ENTER key. If modifications
to the system are required, press the ATTENTION key to enter CP mode and
make the desired modifications; then enter BEGIN to return to CMS mode
and press the ENTER key. Next you must respond to a VSAMGEN message
with the name of your installation's VSAM segment. DMSVGN366R ENTER NAME OF SYSTEM TO BE SAVED: In this example you respond:
cmsvsam
274 IBM VM/370 Planning and System Generation Guide