A Virtual Machine for Updating VM/370 Accessing Disks When you are using the VM/370 procedures to apply updates to system
modules, update file identifiers may be duplicated on more than one
disk; there may be updates that are located in several different places. You should always be sure that you have the correct disks accessed, and
that you have accessed them with an appropriate search order. You may find it convenient to create EXEC procedures that perform the
links and accesses necessary to perform a particular update. For
example to update a CP module, from files located on MAINT's 191 and
294, your EXEC procedure might look like the following: ACCESS 191 A ACCESS 294 B/A ACCESS 394 CIA This search order ensures that if a control file or auxiliary control tha the 191 ?QU
i on
the 191 is used. When updates are made to RSCS the 191 disks provided for these
virtual machines can be linked to and accessed in read/write status, for
example
link rscs 191 195 w wpass
access 195 a
326 IBM VM/370 Planning and System Generation Guide

Upda te Files Files for System Updates
Each of the components of Ve/370 has a unique character module
identifier, which is used to name the component's modules. These
component identifiers are also used to name the files used to update the
components. The identifiers are: CP CMS RSCS IPCS DMK Df!S DMT DMM The default CMS filetypes are used to identify the source, object
code, module files and libraries associated with each component. These
filetypes are: ASSEMBLE TEXT TXTAP MODULE PIACLIB of Source File Object deck (relocatable) Object deck with Attached Processor Support (relocatable)
Nonrelocatable object code Macro or copy library
Two of the update procedures, VPIFPIAC and VMFASM, use the CMS UPDATE command to update macro libraries and source files. Since the updates
that are applied are multilevel updates, there are control files (with a
filetype of CNTRl) and auxiliary control files, (with filetypes of AUXxxxxx) as well as the actual update files (consisting of UPDATE control statements and new source records). These files may have the
following generic filetypes: CNTRL AUXxxxxx UPDTxxxx anything lile Control file
Auxiliary control file
local update (listed in a CNTRl file)
local update (listed in an AUX file) IBf! uses file identifiers as listed below for distributed updates to VM/370. is used for CP source, copy, and macro updates. Its
contents are: TEXT PIACS DMKMAC CMSlIB OSMACRO TEXT AUXRnO QMKEnA is used for CP source, copy, and macro updates with
support for the !ttached Processor. Its contents are: TEXT MACS DMKAMAC DMKMAC CMSLIB OSMACRO AP UPDTAP AP AUXRnO 1n may be 1, 2, 3 and so forth depending on the release level. Part 5. Updating VM/370 327