IBM 890 Highlights, UNIX System Services benefits can include, Distributed Computing Services

cross-network management of data and applications, and the exploitation of traditional zSeries system strengths in an open environment.

Highlights

•X/Open UNIX 95 Branded

•Permanent z/OS UNIX Kernel (restart capability pro- vided in z/OS 1.3)

•Integrated/converged z/OS UNIX Sockets

•Web application and UNIX C program performance improvements

•Improved z/OS UNIX setup

•Multiprocess/Multiuser Kernel Support

•Performance enhancements include recompiled and optimized functions within the kernel, and shell and utili- ties; addition of Socket Functions; use of Communica- tion Storage Management buffer transfer instead of data movement; and optimized NFS Logical File System.

•Multiprocess/Multiuser can allow faster process creation for customers and reduced storage usage for servers

•Semaphores without contention using the hardware Per- form Locked Operation (PLO) instruction

•Shared memory (captured storage) can reduce real stor- age when sharing large amounts of virtual storage

•UNIX System Services and UNIX debugger add support for IEEE-fl oating point

•UNIX System Services provides greater security granu- larity for HFS and zFS fi le systems with support for Access Control Lists (ACLs)

•More fi le descriptors per UNIX process are provided in z/OS 1.6, which supports up to 64K per process

•Additional support for 64-bit programming, conditional variables in shared memory, Euro symbol, and superkill support, along with enhancements to the automount daemon and Unicode

UNIX System Services benefits can include:

•Development and execution of UNIX applications — z/OS is a UNIX platform

•Increased application portfolio on z/OS as Independent Software Vendors can use USS to port their applications to z/OS

•Portability of applications to and from other platforms

•Use of UNIX development skills in a z/OS environment

•Consolidate multiple UNIX systems

•Scalability for high growth UNIX applications

•Parallel Sysplex support to share UNIX fi le systems ben- efi ts with Web server applications and others who access the hierarchical fi le system. This support can make your data and information that reside in the HFS available to your customers at any time, no matter where the applica- tions are running in the Parallel Sysplex environment.

Distributed Computing Services

z/OS Version 1 Release 6 base elements

Network File System (NFS)

DCE Base Services

Distributed File Service (including zFS and SMB)

z/OS UNIX supports hierarchical fi le systems that use UNIX APIs. Applications can work with data in both UNIX hierarchical fi le systems and traditional zSeries data sets.

zSeries File System (zFS)

zFile System (zFS) is the strategic UNIX fi le system for z/OS and complements the z/OS Hierarchical File System (HFS). zFS uses the same APIs as HFS.

zFS can provide the following benefits over HFS:

•Improved performance

•Additional function

–Disk space can be shared between fi le systems in the same data set

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