z/OS DFSMStvs Administration Guide
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Migration tasks

z/OS DFSMStvs Administration Guide
GC52-1388-00

You need to consider each migration task in the following list to implement this change. Required tasks apply to any DFSMS installation enabling the function. Optional tasks apply to only specified operating environments or to situations where there is more than one way to set up or enable the function. For more details on the procedures associated with a given task, see the procedure reference (column 3).

This table lists migration tasks.
System-level tasks Condition Procedure reference
Update the IGDSMSxx member of SYS1.PARMLIB with DFSMStvs parameters Required z/OS MVS Initialization and Tuning Reference
Define resources for DFSMStvs:
  • Create the coupling facility structures for storing log stream data
  • Define the maximum number of log streams for each structure
  • Create the log stream definitions that DFSMStvs needs for its system logs
  • Define staging data sets
  • Authorize access to system log streams
  • Ensure that at least two active data sets and one spare, sharing control data set are always placed for maximum availability
 Required z/OS DFSMStvs Planning and Operating Guide
This table lists migration tasks.
Application-level tasks Condition Procedure reference
For DFSMStvs applications that use COBOL, PL/I, and C/370™ runtime libraries, ensure that the following conditions apply:
  • The application can use DFSMStvs. Ensure that the application functions correctly in a multiple-update environment before you specify DFSMStvs access.
  • COBOL, PL/I, and C/370 support DD-based allocation, in which case you can use the JCL RLS parameter to specify the read integrity option. The recoverable data set is open for DFSMStvs access if its catalog entry specifies that logging is requested and if either CRE is requested or the data set is open for output.
  • If you use DD allocation, you might not need to recompile the application for DFSMStvs.

    Recommendation: Do some conversion of the application to make use of syncpoint processing.

  • COBOL has the ability to create self-contained load modules.
 Optional
Parent topic: Migrating to z/OS Version 1 Release 4

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