International Business Machines Corporation

Wolfgang Eckert

Juergen Erwin Maergner

Christoph Raisch

Markus Helms

Thomas Schlipf

Gerd Konrad Bayer

Klaus Theurich

Harry M Yudenfriend

Donald W Schmidt

Jeffrey Mark Nick

Jeffrey Paul Kubala

Jerry Wayne Stevens

Steven G Glassen

Janet R Easton

Frank William Brice

John S Trotter

Marten J Halma

John Andrew Aiken, Jr

Ambrose A Verdibello, Jr

Heinrich K Lindner

Marcus Eder

Jürgen Märgner

A method and apparatus relates to hardware-to-hardware data transmission in computer systems, and in particular, it relates to method and system for operating I/O adapters attaching either one or more computing devices to an I/O periphery, to a network, or to other computing devices. It is proposed to operate a memory local to the network coupling adapter as a cache memory relative to a system memory associated with the one or more computing devices for storing transmission control information.

Virtualization of I/O adapter resources

Method and apparatus for sending data from one partition to a second partition within a logically partitioned computer. In a data processing system having multiple logical partitions, a send queue is established in the first logical partition, and a receive queue is established in the second logical partition. The send queue is registered in the send queue in a lookup table available to all of the logical partitions. The send queue is registered using as a key the logical partition identification of the first logical partition and the subchannel number (LPAR-ID.SUBCHANNEL#) of the subchannel assigned to the partition. The receive queue is registered in the lookup table using as a key, the internet protocol address of the receive queue in the second partition. A send instruction from the first logical partition is executed which interrogates the lookup table using the LPAR-ID.SUBCHANNEL# key to locate the send queue and IP address key to locate the receive queue, and sends the data in the send queue in the first logical partition to the receive queue in the second logical partition. This method and apparatus provides that discrete servers may be used in each logical partition, and data may be transferred between while maintaining security between the logical partitions.

Communications between partitions within a logically partitioned computer

An Internal I/O Facility (iIOF) having a general interface for executing I/O related applications in an Input/Ouput SubSystem (IOSS) of a computer system. IIOF applications are executed in the IOSS outside the scope of CPU applications executed under the operating system (OS) of the computer system. IIOF applications are allowed to use all facilities in the IOSS. An iIOF subchannel extension is provided for those subchannels which can execute an iIOF application. IIOF subchannel extensions contain interception control fields which determine if conventional processing for the subchannel by the IOSS is to be intercepted to execute an iIOF application. A front-end interception bit in a subchannel extension is used to initiate iIOF application execution when the subchannel is taken from the IOSS work request queue. A back-end interception bit in a subchannel extension is used to initiate iIOF application execution when the subchannel is to have status put on the IOSS interruption queue. The iIOF application is defined in a field in the iIOF subchannel extension. The IOSS may front-end intercept I/O requests made by the OS, and the IOSS may back-end intercept status received by the IOSS for I/O interruptions to be generated by the IOSS.

Method and system for superimposing, creating and altering I/O

Growing community of inventors

Altdorf, Germany

Wolfgang Eckert