Customizing the BPXPRMxx member of SYS1.PARMLIB

The BPXPRMxx member of SYS1.PARMLIB contains the parameters that control processing and the file system. This topic only discusses the BPXPRMxx statements that have planning considerations. For a complete list and descriptions of BPXPRMxx statements, see BPXPRMxx (z/OS UNIX System Services parameters) in z/OS MVS Initialization and Tuning Reference.

You should have two BPXPRMxx members, one defining the values to be used for system setup and the other defining the file systems. Using these two members makes it easier to migrate from one release to another, especially when using the ServerPac method of installation.

When you complete your installation activities, you have one or two BPXPRMxx members, depending on whether you used ServerPac or CBPDO:

With ServerPac, you receive two members, as IBM® recommends.
With CBPDO, after you complete all the instructions in the Program Directory, you have the one member that you copied from SYS1.SAMPLIB.
In this case, you should define a second BPXPRMxx member so that the system setup parameters are in one member and the parameters that define the file systems are in the other.

When you customize the BPXPRMxx members, use columns 1 through 71 for data; columns 72 through 80 are ignored.