Gerald Kreissig

System control structure of the IBM eServer z900

As computer systems become more complex, the use of embedded controllers for initializing and maintaining system operation is becoming increasingly prevalent. In the IBM eServer z900, a new control approach was introduced. This paper discusses why its introduction was necessary and outlines its associated, key technological and economic innovations. In particular, the following topics are addressed: service subsystem topology, hardware elements for performing system control, hardware abstraction, object-oriented framework for control, and internetworking of system control microprocessors.

Data management facilities of an operating system kernel

The paper describes the part of a general operating system Kernel supporting data management functions The operating system Kernel can be imbedded into microcode and viewed as an extended hardware interfaceFour Kernel instructions are defined to support data management They provide a powerful basis for the implementation of different kinds of access methods and file systems, including data base systems Advanced transaction processing concepts such as concurrency control, support of backout, commit and a variety of share options are included.

Single System Image for a Network of Processors

Support of distributed data processing, especially in a local area network, requires major modifications and extensions of existing operating system structures to provide,for example, automatic data set exchange, remote spooling, and terminal passthrough. Most of these facilities can be considered under the common goal of achieving a single system image for a network of processors.