If you have multiple systems in the sysplex, it is typical for system logger to require access to log stream data sets and staging data sets from multiple systems. For this reason, you must specify VSAM SHAREOPTIONS(3,3) for log stream data sets and staging data sets.

If you are using a single system sysplex, there is no requirement for any particular SHAREOPTIONS.

• If you use SMS to manage DASD data sets, use the following procedure to define VSAM share options.

  To define VSAM share options for a log stream's DASD log data sets and staging data sets, set up a data class and associate it with the DASD log data sets and staging data sets in the LOGR policy. Make this association when you define or update the LOGR policy with the Administrative Data Utility (IXCMIAPU). Use the LS_DATACLAS keyword to make the association. If your sysplex has multiple systems, you must use VSAM SHAREOPTIONS(3,3) so that all the systems in the sysplex can share the data sets.

• If you do not use SMS to manage DASD data sets, your installation must do one of the following:
  • Preallocate two data sets, one with the desired characteristics for log data sets and the other with those for staging data sets. Provide an allocation exit to set the DALLIKE text unit that specifies the correct model data set with the correct SHAREOPTIONS(3,3). See z/OS MVS Programming: Authorized Assembler Services Guide for more information.
  • Activate a minimal SMS configuration in which the DATACLAS for logger log data sets and staging data sets has been defined. Provide an ACS DATACLAS routine where the DATACLAS specifies SHAREOPTIONS(3,3) for log stream related data sets. See z/OS DFSMSdfp Storage Administration for more information.