IBM z/OS Version 2 Release 3 enhancementsIBM Europe Software Announcement ZP19-0121
April 23, 2019
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IBM®'s z/OS® V2.3 operating system continuously delivers innovations designed to build and improve the highly scalable and securable next-generation infrastructure needed. IBM z/OS V2.3 delivers the performance, availability, scale, I/O support, and security to provide this infrastructure, giving businesses the ability to instantly react to opportunities.
z/OS is designed to support companies' most mission-critical work while meeting stringent service levels, illustrated by clients that include the world's leading banks, financial services companies, healthcare enterprises, and governments. Focusing on three critical areas, security, simplification, and cloud, z/OS V2.3 enables extensive encryption of data, helps simplify the overall management of the z/OS ecosystem to increase productivity, and provides a simple, consumable approach for self-service provisioning and rapid delivery of software-as-a-service, helping companies to leverage the API economy.
This z/OS V2.3 announcement delivers the following new capabilities:
- Individual files in a z/OS File System (zFS) can now integrate in the existing z/OS data (DFSMShsm and DFSMSdss) backup and restore capability, allowing for centralized data management across the z/OS platform. In addition, backing up and restoring individual z/OS UNIX® files provides a more granular approach to storage management.
- IBM is delivering new function for setup, operation, and access control of NFS on z/OS. This will enable clients to migrate from DFS/SMB to NFS.
- Security improvements are delivered for user key common service area (CSA) storage with the ability to restrict user access to the common storage.
- z/OS continues to stay current on international events with support for the new Japanese era name and ligature announced for May 2019.
- System administration improvement is delivered with the new Automount function, whereby a new zFS file system allocation will fail when there is no alias in the master catalog.
- Client workloads can experience improved workload response time with the new VSAM exploitation of IBM zHyperLink without requiring application changes.
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zFS file level backup and restore capability
The ability to back up and restore individual z/OS UNIX files residing in zFS data sets is now available on z/OS V2.3 through PTFs for APARs across multiple components: OA54218 (z/OS UNIX System Services), OA56145 (zFS), OA52703 (DFSMShsm), OA52836 (DFSMSdss), and OA55165 (RACF®). Backing up and restoring individual z/OS UNIX files provides a more granular approach to storage management. This support is integrated in the existing DFSMShsm and DFSMSdss backup and restore capability, allowing for centralized data management across the z/OS platform. The DFSMShsm and DFSMSdss backup and restore support subsumes the capabilities formerly provided by IBM Tivoli® Storage Manager z/OS UNIX System Services Backup-Archive Client. It will not back up or restore individual z/OS UNIX files found in Hierarchical File System (HFS) data sets because HFS functionality has been stabilized and the impending withdrawal of HFS in a future release of the operating system.
New support in NFS to help clients migrate from DFS/SMB
As announced in Software Announcement ZP18-0290, dated May 15, 2018, z/OS V2.3 will be the last release of the operating system to support the DFS/SMB (Distributed File System / Server Message Block) file-sharing protocol. As such, IBM is delivering new function on z/OS V2.2 and z/OS V2.3 to help clients shift to use the NFS (Network File System) file-sharing technology. To help clients:
- Identify their usage of DFS/SMB, a new migration health check is provided through the PTF for APAR OA56251. This health check will alert the client if DFS/SMB is active on their system.
- Set up the z/OS NFS Server, the PTF for APAR OA56186 delivers a z/OSMF (documentation only) workflow, providing clients step-by-step instructions to configure an NFS Server, which is especially useful for the first-time user.
- Operationally, the z/OS NFS client utilities MVSLOGIN and MVSLOGOUT that allow a non-z/OS client to manage SAF authentication to a z/OS host and SHOWATTR that displays the z/OS NFS server attributes are now delivered for the Windows 10 NFS client through the PTF for APAR OA56187.
- Control access to NFS network shares, Kerberos support has been provided for NFS V3 through the PTF for APAR OA56224, the level of protocol supported by Microsoft Windows 10. This support also allows for integration with Active Directory for UID/GID specification. The z/OS NFS Server already provides Kerberos support for NFS V4. By providing Kerberos-based authentication, the client can enable end-to-end encryption between z/OS and Windows environments.
User key common service area (CSA) storage
An enhanced protection mechanism is provided for user key common service area (CSA) storage usage as well as the means to restrict access to user key common service area (CSA) storage through SAF security protection with the PTF for APAR OA56180.
New Japanese era support in z/OS
On April 30, 2019, the Japanese Heisei era will end and on May 1, a new era named Reiwa, will come into effect, reflecting a change to the Japanese imperial reign. Besides the new era name, a new ligature (symbol) has also been defined representing the Reiwa era.
- Support for the new Japanese era affects multiple z/OS components and will be delivered by the PTF for APAR OA56512, which provides support for the new ligature in z/OS Unicode Services.
- The PTFs for APARs PH05611 and PH08908 provide support for the new Japanese era name and ligature in Language Environment®.
- Web deliverable for the z/OS Font Collection provides support for the new ligature in over 40 WorldType fonts. This support will be made available by April 26, 2019, from the z/OS Downloads website.
New Automount Function
With the PTF for APAR OA56781, the Automount policy can be configured with a new keyword so that any new zFS file system allocation will fail when there is no alias in the master catalog. With an alias, the zFS file system will be created with an entry in the respective user catalog. This enhancement avoids unexpected catalog entries in the master catalog and allows for segregation of catalog entries based on naming conventions.
VSAM exploitation of zHyperLink
- zHyperLink Express® is designed to provide a high-performance data access method on storage subsystems, providing up to 10X lower read latency than High Performance FICON® 1 and enabling clients to cut I/O-sensitive workload response time by up to 50% without requiring application changes. 1 zHyperLink support provides many benefits for VSAM users, including the ability to add new application function to existing I/O-sensitive transactions while maintaining or improving response times. Enhancements in VSAM and VSAM RLS allow read requests to use zHyperLink, when enabled, to perform I/O operations and can be used for all types of VSAM access (NSR, LSR, GSR, and RLS), with the exception of NSR sequential reads. Depending on system conditions, a zHyperLink request can have a much improved elapsed time, allowing VSAM applications to run faster with less latency. 1
- The PTF for APAR OA54872 delivers new enhancements that allow VSAM zHyperLink support to be enabled through SMS StorageClass and VARY SMS commands. VSAM zHyperLink exploitation support is available through PTFs for APARs OA52876 (VSAM RLS) and OA52941 (VSAM) on z/OS V2.2, and later. These zHyperLink enhancements fulfill the Statement of Direction found in Software Announcement ZP17-0316, dated July 17, 2017.
1 Based on projections or measurements completed in a controlled environment. Results may vary by client based on individual workload, configuration, and software levels.
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Announced functionality will be available by June 30, 2019, if not sooner.
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- Software Announcement ZP17-0316, dated July 17, 2017 (z/OS V2.3 GA)
- Hardware Announcement ZG17-0017, dated July 17, 2017 (z14)
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