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Migration Information › Dynamically Back Out from 12.6 to 12.0

Dynamically Back Out from 12.6 to 12.0

If you upgrade to 12.6 from 12.0 without an IPL (and have not IPL’ed with 12.6 installed), you can go back to 12.0 without an IPL.

IMPORTANT! To remove 12.6 dynamically, SECWTO=YES is required. For more information about the security setup of the BATCH, DEACT, REINIT resources for TMSINIT, see the Programming Guide.

To use the features of the Release 12.0, you can back out from 12.6 to 12.0.

Follow these steps:

  1. Stop tape processing and backup the TMC and Audit data sets using your currently installed version of TMSCOPY.
  2. Remove the CA 1 catalog intercept by running the CAS9 procedure with the following control statements for CA 1 in CARIMPRM pointing to the 12.6 libraries: 
    PRODUCT(CA 1/MVS) VERSION(L0C6) INIT(L0C6INIT) -
PARM(REINIT,COSI=NO) -
LOADLIB(hlq.ca1.r126.CTAPLINK)
  3. Stop CTS if active.
  4. Deactivate CA 1 by starting 12.6 TMSINIT and replying with the system password. This process removes the 12.6 OSI intercepts.
  5. Empty the 12.6 members from the 12.0 link-listed library. Copy the entire contents of the backed up 12.0 load library back into the 12.0 link-listed library and issue a F LLA REFRESH.
  6. Load 12.0. dynamically by executing the CAS9 procedure with the following control statements for CA 1 in CARIMPRM: 
    PRODUCT(CA 1/MVS) VERSION(L0C0) INIT(L0C0INIT) -
PARM(REINIT,LPA=ALL,SVC=xxx,SMF=YES) -
LOADLIB(hlq.ca1.r120.CTAPLINK)

PRODUCT(CA 1/MVS) VERSION(L0C0) INIT(L0C0INIT) -
PARM(REINIT,COSI=YES) -
LOADLIB(hlq.ca1.r120.CTAPLINK)
  7. Using the 12.0 options library, start the 12.0 TMSINIT to activate CA 1.
  8. Start CTS if previously active.