Preparing the server for software upgrade or replacement

To prepare the server for software installation, review and perform the preparation tasks that pertain to your server.

• Reviewing software PTF (fix) requirements
  Before you begin the installation process, make sure that your server is ready by reviewing your requirements for program temporary fixes (PTFs).
• Working with critical system values before you install software
  Record and print system values. Check the QSYSLIBL, QUSRLIBL, QALWOBJRST, and QVFYOBJRST system values.
• Verifying the integrity of user-modified system objects
  When you replace your software with the new release, the system keeps changes you made to some IBM-supplied objects.
• Ensuring two-phase commit integrity
  Complete or cancel all pending resynchronizations of commitment control definitions before you replace your software.
• Minimizing software installation time
  These actions can minimize the time required to install your system.
• Gathering performance data for benchmark
  Establish system benchmarks before you install a new version of the operating system or make a major system configuration change such as adding a new software application.