Migrating static allocation of the ACB library to dynamic allocation

Create DFSMDA members to dynamically allocate the inactive ACB library and then restart IMS to use the new DFSMDA members.

To migrate to using the DFSMDA macro for dynamic allocation of ACBLIBs, complete the following steps:

Procedure

  1. Create DFSMDA members for the ACBLIBA and ACBLIBB data sets.
  2. Remove the IMSACBA and IMSACBB DD statements from the IMS and DL/I JCL procedures.
  3. Add a DD statement that points to the data set where the new DFSMDA members reside. The DD statement can be in either the IMS STEPLIB concatenation or IMSDALIB concatenation.
  4. Stop IMS and then restart it with the DFSMDA members.
Now, you can perform the following tasks without stopping and restarting IMS:
  • Increase the size of the inactive ACB library data sets.
  • Correct errors in the inactive ACB library.
  • Add additional data sets to the inactive ACBLIB concatenation.