You can place a single version of both SYS1.UADS and the broadcast data set on a shared DASD and access each one from any system in a multisystem complex by using global resource serialization. That is, the resources SYS1.UADS and the broadcast data set may be globally shared. However, to ensure that you can evaluate the applicability of global resource serialization in your installation's TSO/E environment before using it, the major name (SYSDSN) and the minor names (SYS1.UADS and SYS1.BRODCAST) of both data sets are included in the default SYSTEMS exclusion resource name list distributed by IBM®. That is, the resources are excluded from global sharing. To ensure proper serialization, if you rename the broadcast data set or switch to a broadcast data set with a different name, you must change the minor name to the name of the new broadcast data set. That is, the resources are excluded from global sharing. In the process of evaluation, plan in advance to investigate and measure:

• Resource requirements (the effort required to merge multiple versions of the two data sets into a single version of each and test the new versions)
• Performance implications (one version of each data set accessed by all users versus n versions of the same data sets, each accessed by a subset of those users)

Advantages:

• There are only two data sets to maintain, rather than 2n, where n is the number of systems in a complex.
• A user can log on to any system in a complex to allow a better workload balance.
• For foreground-initiated background jobs, a user who specifies NOTIFY always receives the job-ended message regardless of which system in a complex processed the job.

Requirements:

1. Merge all existing versions of SYS1.UADS and the broadcast data set into a single version of each data set.
2. Modify the resource name lists, as distributed by IBM, as follows:
   1. Delete the minor names SYS1.UADS and SYS1.BRODCAST (or, if the broadcast data set was renamed, the name of the broadcast data set) from the distributed default SYSTEMS exclusion resource name list.
   2. For SYS1.UADS sharing, add the major name SYSIKJUA as a generic entry in the SYSTEM inclusion resource name list.
   3. For broadcast data set sharing, add the major name SYSIKJBC as a generic entry in the SYSTEM inclusion resource name list.