International Business Machines Corporation

Stephen J Schmandt

Roger E Hough

Phil C Yeh

David B Petersen

Ronald M Smith

Kenya Ishimoto

Donald Fred Ault

Peter H Gum

Vincent A Spano

Hirofumi Morita

Lucina L Green

Masao Nishimoto

Katsuhiro Tanaka

Ian Geoffrey Redding

Kazuo Iimura

Goroh Sasaki

Takeo Nakajima

Minoru Massaki

Hiroshi Hirai

Zenhachiroh Butoh

Keiji Amatsu

Nobuo Nomura

Mikio Sakaki

Sandra L Rankin

Fumiaki Abe

Devon S Yu

Kozo Sawada

Akio Saitoh

A distributed data processing system is provided in which two computers, each running under a different operating system, are coupled so that jobs initiated by a first one of the computers can be executed on a second computer by using the resources of the second computer. This enables the user of the first computer to use the second computer under the environment of the first computer. The first computer acts as the interface between the user and the data processing system. Service programs running on the system can handle or provide for input/output operations during the execution of jobs on the second computer so that the jobs seem to the user of the first computer to be executed on the first computer. The system has means for creating a dummy file in the file system of one operating system which is used as a place holder for a corresponding file in a storage device attached to the other operating system, and accessed by programs controlled by that other operating system.

Distributed data processing system having front-end and back-end

A system and method for dispatching logical central processing units (CPUs) among physical CPUs in a multiprocessor computer system having multiple logical partitions, wherein the cryptographic facilities may not be interchangeable. According to the present invention, the logical CPUs are dispatched among the physical CPUs according to either an affinity, floating, or disabled scheduling method. The affinity scheduling method is used when the crypto facilities are not interchangeable or when non-interchangeable crypto functions are performed. The floating scheduling method is used when the cryptographic facilities are interchangeable and interchangeable crypto functions are performed. The disabled scheduling method is used when the logical CPU is not authorized to issue cryptographic instructions.

Scheduling normally interchangeable facilities in multiprocessor

A technique, specifically apparatus and an accompanying method, for use in, e.g., a 'host' operating system (610), for properly updating a dynamically alterable channel program that controls an input/output (I/O) device so as to emulate a 'guest' computer system, that employs dynamic address translation (DAT) in an I/O channel sub-system (150), on a 'host' computer system (10) that does not. This technique performs this updating in a manner that significantly increases channel throughput so as to substantially reduce a performance degradation that would otherwise result from a lack of channel DAT on the host system. Specifically, our technique relies on program controlled interrupt (PCI) chaining coupled with use of 'just-in-time' translation of each new virtual channel program segment generated by a guest operating system (620) and corresponding updating of channel program (415) then executing on the host computer system.

Technique for controlling channel operations in a host computer by

A logically partitioned data processing system has a policy defining responsive actions to be undertaken by a process in one partition because of a monitored failure of an operating system in another partition. When such a failure occurs, the monitoring partition, if authorized, automatically communicates with a hypervisor to initiate the responsive actions on the failing partitions to reset and/or reconfigure that failing partition. Communication of action request between the partition and the hypervisor is accomplished without operator intervention, through a Service Call Logical Processor interface.

Method and apparatus for cross-partition control in a partitioned

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Tokyo, Japan

Stephen J Schmandt