Using multiple START ICEOPT commands

The ICEPRMxx members you activate with a START ICEOPT command stay in effect throughout the IPL unless you issue another successful START ICEOPT command. Each successful execution of ICEOPT activates the ICEPRMxx members you specify, superceding ICEPRMxx members from the previous execution of ICEOPT. So be sure to specify all ICEPRMxx members you need with the START ICEOPT command. As a simple example, if you have the following ICEPRMxx members and ICEMAC macro:

ICEPRMMN:

 JCL
   RESALL=20480
   DYNALOC=(SYSDA,8)
   ABCODE=MSG

ICEPRM01:

 JCL
   DYNALOC=(,12)
   DSA=128

ICEPRM02:

 JCL
   DSA=96
   ABCODE=10

ICEMAC:

   ICEMAC JCL,RESALL=10240,ABCODE=20,DYNALOC=(3390,7),DSA=64,SMF=SHORT

and you use:

START ICEOPT,ICEPRM=(MN,01)

the merged PARMLIB/ICEMAC options for the JCL installation environment are: DYNALOC=(SYSDA,12), DSA=128, RESALL=20480, ABCODE=MSG, SMF=SHORT and the IBM-supplied installation defaults for all of the other installation options.

If you then use:

START ICEOPT,ICEPRM=02

the merged PARMLIB/ICEMAC options for the JCL installation environment are: DSA=96, ABCODE=10, RESALL=10240, DYNALLOC=(3390,7), SMF=SHORT and the IBM-supplied installation defaults for all of the other installation options.

All of the previous ICEPRMMN and ICEPRM01 options are cleared, and only the ICEPRM02 options and ICEMAC options are used. However, if instead you use:

START ICEOPT,ICEPRM=(MN,02)

the merged PARMLIB/ICEMAC options for the JCL installation environment are: DSA=96, ABCODE=10, RESALL=20480, DYNALOC=(SYSDA,8), SMF=SHORT and the IBM-supplied defaults for all of the other installation options.

All of the previous ICEPRMMN and ICEPRM01 options are cleared, but the ICEPRMMN, ICEPRM02 and ICEMAC options are used.

You can clear all of the previous ICEPRMxx options without setting any new options by specifying an ICEPRMxx member with no options in a START ICEOPT command. For example, if ICEPRMCL has:

 /* Clear options */

and you use:

START ICEOPT,ICEPRM=CL

all of the ICEMAC options are used regardless of any previously activated ICEPRMxx members.