IMS 15 base software requirements

The base IMS 15 system runs on z/OS® Version 2 Release 2 or later. Certain features and functions have additional software requirements.

IMS 15 requires the following minimum version, release, or modification levels:

  • z/OS Version 2 Release 2 (5650-ZOS) or later
    • The following z/OS V2R2 APARs must be installed:
      • OA47042
      • OA49728
      • OA51189
    • RACF®, or an equivalent product, if security is used. RACF is available with the IBM® Security Server for z/OS (a separately orderable feature of z/OS V2R2).
    • IBM High-Level Assembler Toolkit, a separately orderable feature of z/OS V2R2.
    • DFSMS 2.2 or 2.3 APAR OA51385 for OLDS zHyperWrite support.
    • For z/OS data set encryption support, one of the following DFSMS versions:
      • DFSMS 2.2 with APAR OA50569 and its prerequisite and corequisite APARs installed.
      • DFSMS 2.3.
  • IRLM Version 2.3 (5635-A06) or later, if data sharing is used. IRLM Version 2.3 is delivered with IMS 15.

    When using multiple IMS systems:

    • On the same z/OS system, you need only one IRLM.
    • Of different release levels on the same z/OS system, you can have one IRLM or you can use two or more IRLM address spaces. If two or more IMS systems share data and are running on the same z/OS system, they should use the same IRLM.
    • On different z/OS systems for inter-processor block-level data sharing, you must have one IRLM on each z/OS system.

IMS 15 also operates in a virtual machine (VM) under control of z/OS. This environment is intended for use in a program development, testing, and non-XRF production environment.

Restrictions: The VM environment has the following restrictions:
  • The Log Analysis utilities might yield inaccurate time-stamp results.
  • If you operate the IMS 15 Transaction Manager under VM for production purposes and have specific throughput or terminal response-time requirements, plan to benchmark under VM to ensure that the proposed configuration meets your performance needs.