International Business Machines Corporation

Kaukab Uddin

Richard Alan Schaeffer

Brent Cameron Beardsley

William Frank Micka

Minh-Ngoc Le Huynh

Satish Chandra Penmetsa

James C Chen

Frederick J Carberry

Rufus J Twito

A method, apparatus and program storage device for providing asynchronous status messaging in a data storage system Asynchronous events are returned from a target to an initiator in response to a Read Message from the initiator. The return status message may or may not be associated with a previously given command or Logical Unit (LUN).

Method, apparatus and program storage device for providing asynchronous status messaging in a data storage system

A method of error management in a data storage system having a target device, with the target device receiving commands from a first initiator and the target device concurrently receiving commands from a second initiator. The target device is typically a storage device operating as a PPRC secondary. A first initiator is a device which communicates with the target device through small computer systems interface (SCSI) protocol. The first initiator is typically a host computer or server. The second initiator communicates with the target device through peer-to-peer remote copy PPRC initiator mode commands. The second initiator is typically a separate storage device in a peer-to-peer remote copy (PPRC) relationship with the target device. The method consists of managing errors associated with a command sent to the target device from the first initiator independently from the management of errors associated with a command sent to the target device from the second initiator.

Concurrent PPRC/FCP and host access to secondary PPRC/FCP device through independent error management

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Milpitas, CA, United States of America

Kaukab Uddin