VSWebCenter.com - OS 7.54.10

OS 7.54.10
VS Operating System

A General Release of the VS Operating System.

Support for Larger Configurations VS Operating System v7.53 allowed for configuration of up to 999 logical devices and could provide support for approximately 999 concurrent active tasks. Many customer configurations however, were limited to a smaller number of concurrently active tasks because other system resource limits would impose lower limits.

The most important of these constraints has been related to a pool of address space that the OS and user tasks use to hold control blocks for active tasks, active and configured devices and open files. This space is called Global Shared memory and is often referred to as GETMEM.

In prior releases of the Operating System, GETMEM was often a constraining factor in creation of systems supporting large user populations.

OS 7.54 includes several related projects that together provide for more address space available for GETMEM and thus for more users.

OS support routines for managing the Global Memory pool have been substantially enhanced and now do a better job of reorganizing GETMEM on the fly in order to recover and reuse address space as files are closed and users log off.

The portion of GETMEM used to hold file control blocks for XDMS files has been moved from its former location to a newly available address segment located above the 16MB boundary. This frees a large amount of space for other types of control blocks and allows a substantial increase in active user population.

Recommendations Getronics makes the following recommendations related to OS 7.54:

Customers whose system usage on OS 7.53.01 is GETMEM constrained should upgrade to 7.54.10.

Sites that do not use XDMS as their file system should upgrade to XDMS prior to upgrading to OS 7.54. The GETMEM enhancements discussed above are not generally available to DMS files since their control block locations have not changed. (Note that XDMS is a superset of DMS. When XDMS is installed the control blocks for all files of either type are in the new GETMEM space. XDMS has other significant performance and recovery advantages. (We recommend XDMS for all VS systems, even systems that do not need OS 7.54 features because of the other significant advantages of XDMS.)

Availability OS 7.54 releases will be available only for VS systems that are properly licensed for VS OS 7.53. OS 7.53 was the only Y2K compliant release. Customers with software support contracts may be entitled to an OS 7.54.10 upgrade. Per incident upgrades will also be available for purchase.

Continued Support for OS 7.53 Many VS sites do not have a need for the enhancements in the various OS 7.54 releases. In order to best serve these customers, Getronics expects to support both OS 7.53 and OS 7.54 baselines for an extended period of time.

This Customer Software Release Notice (CSRN) provides important information for using the files in Release 07.54.10 of the VS Operating System. It describes the enhancements included in the release, and the procedures for installation. This notice also contains system requirements, a list of problems corrected since the previous release, and a list of restrictions and special considerations that apply to the release.

VS Operating System CSRN
v7.54.10
51 Pages / 80Kb

This Customer Software Release Notice (CSRN) provides important information for using Release 01.54.10 of the VS Extended Data Management System package. This package runs on VS Operating System version 07.54.10 or later.

VS Extended Data Management System
v1.54.10
5 Pages / 6Kb

This Customer Software Release Notice (CSRN) provides important information for using Release 1.54.10 of the VS XDMS Cluster Server and is intended for all users.

VS XDMS Cluster Server
v1.54.10
8 Pages / 6Kb

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