International Business Machines Corporation

Kenneth J Oakes

Harry M Yudenfriend

Steven G Glassen

Peter Dana Driever

Peter Grimm Sutton

John S Trotter

Leslie W Wyman

Peter Kenneth Szwed

Tan Lu

Charles W Gainey, Jr

Dale Francis Riedy, Jr

Scott M Carlson

William J Rooney

Marten J Halma

Greg A Dyck

Frank William Brice

Charles E Shapley

Jeffrey Paul Kubala

Elpida Tzortzatos

Janet R Easton

Thomas B Mathias

John R Flanagan

Daniel Francis Casper

Allan Samuel Meritt

Hans-Helge Lehmann

Francis Gassert

Martin Taubert

Craig A Bickelman

Robert Edward Galbraith

Eugene P Hefferon

Elke G Nass

Christopher J Colonna

Beth A Glendening

Roger E Hough

Mooheng Zee

Joachim Von Buttlar

Kenneth J Fredericks

David E Stucki

Andrew W Piechowski

Suzanne M John

Bruce H Ratcliff

Gustav E Sittmann, Iii

Richard Cwiakala

Andreas Kohler

Assaf Marron

James C Mazurowski

Paul S Frazer

Ulrich Helmich

Ugochukwu Njoku-Charles

David W Hollar

Donald W Schmidt

Stephen R Valley

Arthur James Stagg

Michael E Baskey

Thomas Edward Cook

Joseph C Elliott

Carol B Hernandez

Martin W Sachs

Allen H Preston

Richard Roland Guyette

Kenneth M Trowell

Frank W Brice

Mark J Fantacone

Ambrose Verdibello

Robert A Smith

John C Rathjen, Jr

Paul A Malinowski

Roberto J Sanchez

Robert M Whalen, Jr

Miriam P Brown

Ugochukwo Njoku-Charles

Michael G Melendy

An abstraction for storage class memory is provided that hides the details of the implementation of storage class memory from a program, and provides a standard channel programming interface for performing certain actions, such as controlling movement of data between main storage and storage class memory or managing storage class memory.

Configure storage class memory command

An example computer-implemented method may include receiving, by a general purpose processor, the I/O operation. The method may further include transmitting, by the general purpose processor, the I/O operation to a system assist processor. The method may further include transmitting, by the system assist processor, the I/O operation to an I/O channel for execution by the I/O channel, wherein transmitting the I/O operation to the I/O channel comprises queuing the I/O operation in the multi-queue. The method may further include executing, by the I/O channel, the I/O operation.

Dispatch input/output traffic to channels with multiple channel communication array queues

Examples of techniques for processing I/O operations in a channel are disclosed. In one example implementation according to aspects of the present disclosure, a computer-implemented method may include: copying, by a system assist processor, a subchannel of the channel into a lower portion of a channel communication area responsive to receiving the I/O operation; copying, by the system assist processor, channel program information from a designated starting location in a customer memory into a control block; building, by the system assist processor, a starting channel communication area into a top portion of the control block; queuing, by the system assist processor, the control block to a queue for the channel; processing, by the channel, the I/O operation responsive to retrieving the control block from the queue.

Processing input/output operations in a channel using a control block

Data returned responsive to executing a start subchannel instruction

Moving blocks of data between main memory and storage class memory

Clearing blocks of storage class memory

Deconfigure storage class memory command

An Extended Input/output (I/O) measurement word facility is provided. Provision is made for emulation of the Extended I/O measurement word facility. The facility provides for storing measurement data associated with a single I/O operation in an extended measurement word associated with an I/O response block. In a further aspect, the stored data may have a resolution of approximately one-half microsecond.

Extended input/output measurement word facility for obtaining measurement data in an emulated environment

A computer program product is provided and includes a tangible storage medium readable by a processing circuit and storing instructions for execution by the processing circuit for performing a method. The method includes detecting connections of two or more input/output (I/O) adapters, each of the two or more I/O adapters having one or more solid state devices (SSDs) connected thereto, and presenting a storage class memory address space for all of the connected SSDs that is independent of connections and disconnections between each of the one or more SSDs and each of the two or more I/O adapters and the processing unit.

Firmware management of storage class memory for connected or disconnected I/O adapters

A computer program product is provided and includes a tangible storage medium readable by a processing circuit and storing instructions for execution by the processing circuit for detecting connections of two or more input/output (I/O) adapters, each of the two or more I/O adapters having one or more solid state devices (SSDs) connected thereto, and presenting a storage class memory address space for all of the connected SSDs that is independent of connections and disconnections between each of the one or more SSDs and each of the two or more I/O adapters and the processing unit.

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Wappingers Falls, NY, United States of America

Kenneth J Oakes