Before doing an IPL on either LPAR or both, make sure you know what volumes are on each LPAR and what the duplicate Volsers are. You should go here, display the volumes and print out the displays so you have hardcopy at hand when you IPL.
As you IPL, you may need to reply r 00,CONT when requested or r 00,xxx' where xxx is the address to be put OFFLINE.
Address 522 has volser R04CAT for the Prod LPAR.
Address 581 has volser R04CAT for the Test LPAR.
When IPL of Prod LPAR finds the duplication and asks which to put offline, you would enter r 00,581.
When IPL of Test LPAR finds the duplication and asks which to put offline, you would enter r 00,522.
The same would be done for other duplicate volsers as necessary.
If you don't know already, there's probably a reason.
This can be done in advance of the outage.
Cycle to CPC Operational Customization
Drag/Drop to CUSTOMIZE Support Element DATE/TIME
USE NEW TIME
Have someone browse http://tycho.usno.navy.mil/simpletime.html to display time
Synchronize SE Clock with browsed clock.
Click Yes/Ok as asked.
Redisplay time to be sure synched fairly close.
(If Clock Reset, do POR/Activate immediately after z/OS shutdown).
Drag/Drop CPC on Single Object Operation
Cycle to CPC Recovery
Drag/Drop CPC on Power-On-Reset
popup: GENERAL - select IOCDS LPARN A2
Log Off Single Object Operations.
Cycle to CPC Recovery
Select Prod LPAR and Activate
Select Test LPAR and Activate
If POR is part of Clock change:
to advance to Daylight Saving Time, do IPL immediately
to fall back to Standard Time, wait 1+ hour before IPL
IPL Screen Shots
If Spring Clock Reset, IPL immediately after POR/Activate.
If Autumn Clock Reset, wait 1+ hour after POR/Activate.
On CPC Recovery:
Drag/Drop PROD to LOAD
specify IPL 052A IODF 0991 PARMLIB 08
Enter '052A' into 1st box, '099108' in 2nd box
Drag/Drop TEST to LOAD
specify IPL 0524 IODF 0991 PARMLIB 08
Enter '0524' into 1st box, '099108' in 2nd box
Groups - highlight DEFINED CPC
Drag to or click on Single Object Operations
Drag DEFINED CPC to or click on I/O Config
OK as asked
Highlight desired IOCDS
Enable or Disable as desired
Click Upper Left of Support Element Workplace window