z/OS is IBM’s flagship operating system for its mission critical z System enterprise servers. Earlier this week IBM lifted the veil on the upcoming z/OS 2.3 release, with general availability planned for September, 2017. IBM’s Early Support Program is potentially available to those z/OS licensees who can’t wait that long. (Ask “your friendly IBM representative” if you’d like to join the ESP.) The preview announcement is chock full of interesting new features. I am particularly interested in these items:

  • z/OS 2.3 will require an IBM zEC12, zBC12, or higher model machine. That’s a fairly aggressive leap forward, but in my view it’s a sensible one. Setting a higher baseline means that z/OS can do more to exploit newer instructions and other newer model features.
  • z/OS and its predecessor, OS/390, have included encryption services for decades, but this release makes encryption of data sets, zFS, and CF structures much easier to implement because there’s no need to change applications.
  • Communications Server will incorporate a network security “sanity check” (my term) feature, to warn administrators if they’re not being at least reasonably careful to encrypt network connections. (Philip Young might appreciate this new feature.)
  • z/OSMF will support a standard software installation package for z/OS, based on some recent vendor consensus. Consequently z/OSMF will support both SMP/E and non-SMP/E (but also standard) software installation.
  • z/OSMF will integrate the z/OS incident log with IBM’s support database to find likely APARs (fixes or documented workarounds) automatically.
  • XML System Services will use 64-bit address spaces, to handle larger XML documents.
  • Eight character TSO/E user IDs!
  • IBM Knowledge Center for z/OS will include a message lookup feature.
  • The Sub-Capacity Reporting Tool (SCRT) is moving into the base operating system, and IBM is opening it up to software vendors.
  • Workload Manager will have a “maximum zIIP” control (my term) that can be applied to particular service classes. WLM will require all zIIP-eligible work within these controlled service classes to execute only on zIIPs, never on general purpose engines.
  • Online migration of HFS to zFS, and online repair of zFS. (IBM expects that the z/OS release after Version 2.3 will be the last to support HFS.)
  • RACF user ID to e-mail conversion and mapping.
  • JES2 job notifications and z/OSMF event notifications via e-mail.
  • Although z/OS 2.3 will still be available on tape media, IBM says it’ll discontinue tape media deliveries of z/OS and related products in the future. Electronic delivery (Internet downloads) and DVD media will continue to be available.

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