International Business Machines Corporation

Edwin K Scott

Carol Santich Mellgren

Matthew J Kalos

Gail Andrea Spear

Richard Anthony Ripberger

Susan Kay Candelaria

Theodore Timothy Harris, Jr

James Chien-Chiung Chen

Chung Man Fung

Minh-Ngoc Le Huynh

Patricia Ching Lu

Angqin Bai

Alex Chen

Nicholas D Fifer

Jeffery Michael Barnes

Tracks of data or other data units are copied from a primary storage system to a secondary storage system. For multiple-track or multiple-data unit transfers, a group of tracks or data units which are sequentially related are transferred. A respective task is defined at the primary storage system for monitoring a progress of the transfer of each of the respective data units in a group. A state is maintained for monitoring a progress of the transfer of the group responsive to the progress of each of the tasks. A normal state is selected when there are no failed tasks. A recovery state is selected when there is a failure, and the status of the remaining tasks is being ascertained. A retry state is selected following the recovery state to retry the failed tasks. A failed state indicates an unrecoverable failure.

Method of maintaining task sequence within a task domain across error recovery

Provided are a method, system, and program for copying tracks between a primary controller and secondary controller. A track is received from the primary controller that is part of a copy job comprising a sequence of tracks to copy along with a sequence number of the received track and a context number identifying computational resources in the primary controller used to transmit the track, sequence number, and context number. The context number and sequence number transmitted with the track are used to determine if a track preceding the received track was written to storage. The secondary-controller writes the received track to storage if the track preceding the received track was written to storage.

Method, system, and program for copying tracks between a primary storage and secondary storage

A computer storage system includes a supervisor algorithm to detect a host computer's initiator logging in. The supervisor algorithm identifies data storage devices associated with the newly logged-on initiator and tags logical unit number control blocks ('LUNCBs') as having priority in an initiation process. The supervisor algorithm assigns a task control block to each of the identified data storage devices and invokes a logical unit number ('LUN') initialization algorithm. If the supervisor algorithm was invoked during an initial microcode load (&#x201c;IML&#x201d;) event, the LUN initialization algorithm initializes each of the identified data storage devices. However, if the supervisor algorithm was invoked during a warmstart procedure, the LUN initialization algorithm first checks to make sure the LUNCB was not mistakenly written too. If not, the LUN initialization algorithm terminates without initializing the associated data storage device. Otherwise, the associated data storage device is initialized and the LUN initialization algorithm terminates.

Priority initialization system

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Tucson, AZ, United States of America

Edwin K Scott