IPL and maintenance - IBA-mainframe-dev/Global-Repository-for-Mainframe-Developers GitHub Wiki

IPL and maintenance

To start initializing the system, enter from the console:

IPL xxxx LOADPARM aaaabbcd

where

  • xxxx - device address from which to initialize the system (it is also called system residense volume - SYSRES)
  • аааа - device address where the IODF config is located
  • bb - LOAD member number
  • c - IMSI (initialization message suppression indicator) - the prompting and message suppression characteristics
  • d - nucleus data set number - IEANUC0d и IEANUC2d

If the LOADPARM keyword is not specified, by default:

  • the search for the IODF file will be performed on the SYSRES volume
  • LOAD00 will be selected
  • IMSI - blank - suppresses most informational messages and does not prompt for system parameters; will use the LOAD member values
  • if NUCLEUS parameter is not specified in LOAD00, nucleus data set number - 1 (IEANUC01 и IEANUC21)

LOADyy parameters

During IPL, the system looks for LOADyy member in the following order:

  1. SYS0.IPLPARM through SYS9.IPLPARM on the IODF volume
  2. SYS1.PARMLIB on the IODF volume
  3. SYS1.PARMLIB on the SYSRES volume

LOAD contains many initialization parameters. As an example, a LOAD member might look like this:

IODF     00 SYS1                                            
SYSCAT   VOL001113CCATALOG.Z23D.MASTER                      
SYSPARM  AL                                                 
IEASYM   00                                                 
NUCLST   00                                                 
PARMLIB  DSN1.PARMLIB                                 VOL002
PARMLIB  DSN2.PARMLIB                                 VOL003
PARMLIB  SYS1.PARMLIB                                 VOL005
NUCLEUS  1

where

  • IODF - SYS1.IODF00 will be used as a configuration file
    • SYS1 - high level qualifier
    • 00 - IODF id
  • SYSCAT - identifies the master catalog
  • SYSPARM - identifies IEASYSAL member from PARMLIB concatenation.
  • IEASYM - identifies IEASYM00 member where static system symbols defined
  • NUCLST - identifies NUCLST00 that system will use
  • PARMLIB - the following data sets will be included
    • DSN1.PARMLIB
    • DSN2.PARMLIB
    • SYS1.PARMLIB on VOL005
    • system automatically concatenates SYS1.PARMLIB from master catalog
  • NUCLEUS - nucleus data set number - IEANUC01 и IEANUC21

To display information about your system IPL, enter

/D IPLINFO